HBASE-7861 Use the ServerName in the Connection#getClient and Connection#getAdmin code

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1446897 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7856 HTU#waitTableAvailable should have a default value of 30s

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1446898 13f79535-47bb-0310-9956-ffa450edef68