HBASE-9082 A bunch of tests have client retries only but bulid boxes are contended and overloaded

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1508488 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9088 TestSplitLogManager.testMultipleResubmits fails

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1508591 13f79535-47bb-0310-9956-ffa450edef68