HBASE-12581 TestCellACLWithMultipleVersions failing since task 5 HBASE-12404 (HBASE-12404 addendum)
HBASE-12563 After Starting up mini hbase cluster, Real Configuration of Cluster never set to HBaseTestingUtility (Talat UYARER)
HBASE-12518 Task 4 polish. Remove CM#{get,delete}Connection

Remove deleteConnection from everywhere except the two tests that ensure
it does the right thing and from HCM and CM themselves.

Undoes deleteConnection from tests and from the web ui