HBASE-9848 Make regionserver Canary exit with different exit codes

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1536470 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9851 TestHBaseFsck.testQuarantineMissingHFile is flaky

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1536504 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9814 TestRegionServerCoprocessorExceptionWithRemove mentions master in javadoc



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1536519 13f79535-47bb-0310-9956-ffa450edef68