HBASE-8912 [0.94] AssignmentManager throws IllegalStateException from PENDING_OPEN to OFFLINE

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1554933 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10249 Intermittent TestReplicationSyncUpTool failure (Demai Ni)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1554937 13f79535-47bb-0310-9956-ffa450edef68