当多线程并发执行appendToClassLoaderSearch0时，会抛出异常

当前one-java-agent会并发加载plugin，其中有可能并发执行`InstrumentationImpl.appendToSystemClassLoaderSearch`，有概率抛出`IllegalArgumentException`和`java.lang.InternalError`。

附上报错信息：
```
2022-06-16 09:51:09 [oneagent plugin ahas-java-agent start] ERROR c.a.o.plugin.PluginManagerImpl -start plugin error, name: ahas-java-agent
com.alibaba.oneagent.plugin.PluginException: start error, agent jar::/home/admin/.opt/ArmsAgent/plugins/ahas-java-agent/ahas-java-agent.jar
at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:113)
at com.alibaba.oneagent.plugin.PluginManagerImpl.startOnePlugin(PluginManagerImpl.java:294)
at com.alibaba.oneagent.plugin.PluginManagerImpl.access$200(PluginManagerImpl.java:22)
at com.alibaba.oneagent.plugin.PluginManagerImpl$2.run(PluginManagerImpl.java:325)
at java.lang.Thread.run(Thread.java:855)
Caused by: java.lang.IllegalArgumentException: null
at sun.instrument.InstrumentationImpl.appendToClassLoaderSearch0(Native Method)
at sun.instrument.InstrumentationImpl.appendToSystemClassLoaderSearch(InstrumentationImpl.java:200)
at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:100)
... 4 common frames omitted
2022-06-16 09:51:09 [oneagent plugin arms-agent start] ERROR c.a.o.plugin.PluginManagerImpl -start plugin error, name: arms-agent
com.alibaba.oneagent.plugin.PluginException: start error, agent jar::/home/admin/.opt/ArmsAgent/plugins/ArmsAgent/arms-bootstrap-1.7.0-SNAPSHOT.jar
at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:113)
at com.alibaba.oneagent.plugin.PluginManagerImpl.startOnePlugin(PluginManagerImpl.java:294)
at com.alibaba.oneagent.plugin.PluginManagerImpl.access$200(PluginManagerImpl.java:22)
at com.alibaba.oneagent.plugin.PluginManagerImpl$2.run(PluginManagerImpl.java:325)
at java.lang.Thread.run(Thread.java:855)
Caused by: java.lang.IllegalArgumentException: null
at sun.instrument.InstrumentationImpl.appendToClassLoaderSearch0(Native Method)
at sun.instrument.InstrumentationImpl.appendToSystemClassLoaderSearch(InstrumentationImpl.java:200)
at com.alibaba.oneagent.plugin.TraditionalPlugin.start(TraditionalPlugin.java:100)
... 4 common frames omitted
```

Iniziate esaminando TraditionalPlugin.java alle righe 100 e 113, quindi tracciate l'avvio concorrente attraverso PluginManagerImpl.java alle righe 294 e 325. Riproducete il caricamento parallelo dei plugin intorno a appendToSystemClassLoaderSearch e verificate che le IllegalArgumentException e InternalError segnalate non si verifichino più.

Scritto dal modello di indicizzazione a partire dal testo della issue.