HBASE-7122 Proper warning message when opening a log file with no entries (idle cluster)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1471256 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8395 Remove TestFromClientSide.testPoolBehavior

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1471257 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8380 NPE in HBaseClient.readResponse

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1471272 13f79535-47bb-0310-9956-ffa450edef68