ABFS driver continues to retry on IOException responses from REST operations

ABFS driver continues to retry (until retry count is exhausted) upon IOException responses from REST operations.  

In the exception hander for IOExceptions at https://github.com/apache/hadoop/blob/65f60e56b082faf92e1cd3daee2569d8fc669c67/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsRestOperation.java#L174-L197, there is no way exit out of the retry loop by re-throwing an exception unless one of the following conditions have been met:

• The retry limit was hit
• An HttpException was encountered

From an org.apache.hadoop.fs.azurebfs.extensions.CustomTokenProviderAdaptee or org.apache.hadoop.fs.azurebfs.extensions.CustomDelegationTokenManager implementation, there is no way to create an org.apache.hadoop.fs.azurebfs.oauth2.AzureADAuthenticator.HttpException since the constructor is package private. 

Either the exception handler needs to generic handle exceptions like java.nio.file.AccessDeniedException and java.io.FileNotFoundException, or the access to org.apache.hadoop.fs.azurebfs.oauth2.AzureADAuthenticator.HttpException needs to be set to that custom implementations can use it.