Revert "HBASE-12694 testTableExistsIfTheSpecifiedTableRegionIsSplitParent in TestSplitTransactionOnCluster class leaves regions in transition (Vandana Ayyalasomayajula)"

This reverts commit 51cb0fe6eb3244de40dd508c9d68cb98e2ca4eca.
HBASE-12724 Upgrade the interface audience of RegionScanner from Private to LimitedPrivate
HBASE-12715 getLastSequenceId always return -1

Signed-off-by: Andrew Purtell <apurtell@apache.org>