HBASE-8406 Fix rat check and rat warning in trunk

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1471170 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7921. TestHFileBlock.testGzipCompression should ignore the block checksum

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1471225 13f79535-47bb-0310-9956-ffa450edef68