Detection of orphaned table znode should cover table in Enabled state

HBASE-12070 introduced fix for orphaned table znode where table doesn't have entry in hbase:meta

When Stephen and I investigated rolling upgrade failure,

2015-10-27 18:21:10,668 WARN  [ProcedureExecutorThread-3] procedure.CreateTableProcedure: The table smoketest does not exist in meta but has a znode. run hbck to fix inconsistencies.

we found that the orphaned table znode corresponded to table in Enabled state.
Therefore running hbck didn't report the inconsistency.

Detection for orphaned table znode should cover this case.