HBASE-8506 Remove unused/dead classes

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1480493 13f79535-47bb-0310-9956-ffa450edef68
HBASE-1762 Remove concept of ZooKeeper from HConnection interface

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1480501 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8498 PB WAL reading is broken due to some partial reads

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1480511 13f79535-47bb-0310-9956-ffa450edef68