HBASE-12312 Another couple of createTable race conditions

Signed-off-by: stack <stack@apache.org>

Conflicts:
	hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestReplicationBase.java
	hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/TestScanEarlyTermination.java