checkAccess operation in AzureFileSystemProvider should allow AccessMode.READ

At the moment(azure-storage-blob-nio version 12.0.0-beta.35) throws AccessDeniedException when you try to use `Files.copy(azureBlobSource, localDestinationFile)`

Reason is this snippet in the beginning of the method:

```java
if (accessModes != null && accessModes.length != 0) {
throw LoggingUtility.logError(ClientLoggerHolder.LOGGER,
new AccessDeniedException("The access cannot be determined."));
}
```

Problem is that `java.nio.file.CopyMoveHelper` invokes it like this:

```java
provider.checkAccess(source, AccessMode.READ);
```

Is it possible to change condition to following instead?

```java
if (accessModes != null && accessModes.length != 0 && (accessModes.length != 1 || accessModes[0] != AccessMode.READ)) {
throw LoggingUtility.logError(ClientLoggerHolder.LOGGER,
new AccessDeniedException("The access cannot be determined."));
}
```