[Flakey Tests] TestBindExceptionHandling.testProtocolPortClash doesn't assert clean starting point

[ERROR] org.apache.hadoop.hbase.thrift.TestBindExceptionHandling.testProtocolPortClash  Time elapsed: 6.441 s  <<< ERROR!
org.apache.hadoop.metrics2.MetricsException: Metrics source Thrift,sub=ThriftOne already exists!
	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:152)
	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:125)
	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:229)
	at org.apache.hadoop.hbase.metrics.BaseSourceImpl.<init>(BaseSourceImpl.java:119)
	at org.apache.hadoop.hbase.metrics.ExceptionTrackingSourceImpl.<init>(ExceptionTrackingSourceImpl.java:47)
	at org.apache.hadoop.hbase.thrift.MetricsThriftServerSourceImpl.<init>(MetricsThriftServerSourceImpl.java:58)
	at org.apache.hadoop.hbase.thrift.MetricsThriftServerSourceFactoryImpl.createThriftOneSource(MetricsThriftServerSourceFactoryImpl.java:42)
	at org.apache.hadoop.hbase.thrift.ThriftMetrics.<init>(ThriftMetrics.java:77)
	at org.apache.hadoop.hbase.thrift.ThriftServer.createThriftMetrics(ThriftServer.java:206)
	at org.apache.hadoop.hbase.thrift.ThriftServer.setupParamters(ThriftServer.java:234)
	at org.apache.hadoop.hbase.thrift.ThriftServer.run(ThriftServer.java:853)
	at org.apache.hadoop.hbase.thrift.ThriftServerRunner.run(ThriftServerRunner.java:55)