HBASE-9593 Region server left in online servers list forever if it went down after registering to master and before creating ephemeral node

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1535480 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7600 TestAdmin.testCreateBadTables is failing occasionally (Liu Shaohui)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1535605 13f79535-47bb-0310-9956-ffa450edef68