TezConstants.TEZ_SHUFFLE_HANDLER_SERVICE_ID is referenced in Hive

TezConstants is marked as private.
However, TezConstants.TEZ_SHUFFLE_HANDLER_SERVICE_ID is referenced in Hive

https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/TaskRunnerCallable.java#L219

https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/ContainerRunnerImpl.java#L172

Post TEZ-3334 merge, this would throw "cannot find symbol" exception during compilation.

May be easier option would be add TezConstants.TEZ_SHUFFLE_HANDLER_SERVICE_ID and reference it in TezConfiguration.TEZ_AM_SHUFFLE_AUXILIARY_SERVICE_ID_DEFAULT as hive supports multiple versions of tez.