HBASE-8165 Update our protobuf to 2.5 from 2.4.1; REVERT

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1466759 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8165 Update our protobuf to 2.5 from 2.4.1; REVERT

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1466760 13f79535-47bb-0310-9956-ffa450edef68