[Bug Report] JMusicBot fails to download native libraries if another user on the computer has already ran JMusicBot

**Describe the bug**
If you are trying to run JMusicBot on a Linux server which already has another user running JMusicBot, it will crash with an error due to being unable to make a directory in /tmp for the native libraries.

**To Reproduce**
Steps to reproduce the behavior:
1. Create a user on a Linux server, download, and run JMusicBot
2. Create a second user on the Linux server, download, and run JMusicBot
3. Tell JMusicBot running under user #2 to play a song. It will crash with the error listed below:

**Workaround**
As a user with permission, or with admin privileges, empty /tmp.

**Crash Dump**
```
[09:48:39] [INFO] [Config]: Loading config from /home/timothy/JMusicBot/bin/config.txt
[09:48:39] [INFO] [Startup]: Loaded config from /home/timothy/JMusicBot/bin/config.txt
[09:48:40] [INFO] [JDA]: Login Successful!
[09:48:40] [INFO] [WebSocketClient]: Connected to WebSocket
[09:48:40] [INFO] [JDA]: Finished Loading!
[09:48:49] [ERROR] [LocalAudioTrackExecutor]: Error in playback of L_jWHffIx5E
com.sedmelluq.discord.lavaplayer.tools.FriendlyException: Something broke when playing the track.
at com.sedmelluq.discord.lavaplayer.tools.ExceptionTools.wrapUnfriendlyExceptions(ExceptionTools.java:43)
at com.sedmelluq.discord.lavaplayer.track.playback.LocalAudioTrackExecutor.execute(LocalAudioTrackExecutor.java:102)
at com.sedmelluq.discord.lavaplayer.player.DefaultAudioPlayerManager.lambda$executeTrack$1(DefaultAudioPlayerManager.java:349)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.LinkageError: Failed to load native library due to an exception.
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.load(NativeLibLoader.java:81)
at com.sedmelluq.discord.lavaplayer.natives.ConnectorNativeLibLoader.loadConnectorLibrary(ConnectorNativeLibLoader.java:16)
at com.sedmelluq.discord.lavaplayer.natives.opus.OpusDecoderLibrary.getInstance(OpusDecoderLibrary.java:14)
at com.sedmelluq.discord.lavaplayer.natives.opus.OpusDecoder.(OpusDecoder.java:21)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.initialiseDecoder(OpusPacketRouter.java:190)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.checkDecoderNecessity(OpusPacketRouter.java:174)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.process(OpusPacketRouter.java:91)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaOpusTrackConsumer.consume(MatroskaOpusTrackConsumer.java:47)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.processFrameInBlock(MatroskaStreamingFile.java:372)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.parseClusterSimpleBlock(MatroskaStreamingFile.java:336)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.parseNextCluster(MatroskaStreamingFile.java:321)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.provideFrames(MatroskaStreamingFile.java:297)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaAudioTrack.lambda$process$0(MatroskaAudioTrack.java:39)
at com.sedmelluq.discord.lavaplayer.track.playback.LocalAudioTrackExecutor.executeProcessingLoop(LocalAudioTrackExecutor.java:257)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaAudioTrack.process(MatroskaAudioTrack.java:38)
at com.sedmelluq.discord.lavaplayer.track.DelegatedAudioTrack.processDelegate(DelegatedAudioTrack.java:27)
at com.sedmelluq.discord.lavaplayer.source.youtube.YoutubeAudioTrack.processStatic(YoutubeAudioTrack.java:75)
at com.sedmelluq.discord.lavaplayer.source.youtube.YoutubeAudioTrack.process(YoutubeAudioTrack.java:67)
at com.sedmelluq.discord.lavaplayer.track.playback.LocalAudioTrackExecutor.execute(LocalAudioTrackExecutor.java:90)
... 4 common frames omitted
Caused by: java.io.IOException: Failed to create directory for unpacked native library.
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.extractLibrary(NativeLibLoader.java:104)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.load(NativeLibLoader.java:77)
... 22 common frames omitted
Caused by: java.nio.file.AccessDeniedException: /tmp/lava-jni-natives/1544694529585
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
at java.nio.file.Files.createDirectory(Files.java:674)
at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
at java.nio.file.Files.createDirectories(Files.java:767)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.createDirectoriesWithFullPermissions(NativeLibLoader.java:123)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.extractLibrary(NativeLibLoader.java:100)
... 23 common frames omitted
Exception in thread "lava-daemon-pool-playback-1-thread-1" java.lang.LinkageError: Failed to load native library due to an exception.
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.load(NativeLibLoader.java:81)
at com.sedmelluq.discord.lavaplayer.natives.ConnectorNativeLibLoader.loadConnectorLibrary(ConnectorNativeLibLoader.java:16)
at com.sedmelluq.discord.lavaplayer.natives.opus.OpusDecoderLibrary.getInstance(OpusDecoderLibrary.java:14)
at com.sedmelluq.discord.lavaplayer.natives.opus.OpusDecoder.(OpusDecoder.java:21)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.initialiseDecoder(OpusPacketRouter.java:190)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.checkDecoderNecessity(OpusPacketRouter.java:174)
at com.sedmelluq.discord.lavaplayer.container.common.OpusPacketRouter.process(OpusPacketRouter.java:91)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaOpusTrackConsumer.consume(MatroskaOpusTrackConsumer.java:47)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.processFrameInBlock(MatroskaStreamingFile.java:372)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.parseClusterSimpleBlock(MatroskaStreamingFile.java:336)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.parseNextCluster(MatroskaStreamingFile.java:321)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaStreamingFile.provideFrames(MatroskaStreamingFile.java:297)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaAudioTrack.lambda$process$0(MatroskaAudioTrack.java:39)
at com.sedmelluq.discord.lavaplayer.track.playback.LocalAudioTrackExecutor.executeProcessingLoop(LocalAudioTrackExecutor.java:257)
at com.sedmelluq.discord.lavaplayer.container.matroska.MatroskaAudioTrack.process(MatroskaAudioTrack.java:38)
at com.sedmelluq.discord.lavaplayer.track.DelegatedAudioTrack.processDelegate(DelegatedAudioTrack.java:27)
at com.sedmelluq.discord.lavaplayer.source.youtube.YoutubeAudioTrack.processStatic(YoutubeAudioTrack.java:75)
at com.sedmelluq.discord.lavaplayer.source.youtube.YoutubeAudioTrack.process(YoutubeAudioTrack.java:67)
at com.sedmelluq.discord.lavaplayer.track.playback.LocalAudioTrackExecutor.execute(LocalAudioTrackExecutor.java:90)
at com.sedmelluq.discord.lavaplayer.player.DefaultAudioPlayerManager.lambda$executeTrack$1(DefaultAudioPlayerManager.java:349)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Failed to create directory for unpacked native library.
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.extractLibrary(NativeLibLoader.java:104)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.load(NativeLibLoader.java:77)
... 22 more
Caused by: java.nio.file.AccessDeniedException: /tmp/lava-jni-natives/1544694529585
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
at java.nio.file.Files.createDirectory(Files.java:674)
at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
at java.nio.file.Files.createDirectories(Files.java:767)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.createDirectoriesWithFullPermissions(NativeLibLoader.java:123)
at com.sedmelluq.discord.lavaplayer.natives.NativeLibLoader.extractLibrary(NativeLibLoader.java:100)
... 23 more
```

**Version Info (please complete the following information):**
- Operating System: Ubuntu Server 18.04 LTS
- JMusicBot Version: 0.2.1

Reproduce the failure with two Linux users running JMusicBot and inspect the NativeLibLoader.extractLibrary and createDirectoriesWithFullPermissions calls shown in the stack trace. Trace how the native library path under /tmp/lava-jni-natives is selected and verify that playback succeeds for both users without manually clearing /tmp.

Written by the indexing model from the issue text.