HBASE-10134 Fix findbug warning in VisibilityController



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550340 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10135 Remove ? extends from HLogSplitter#getOutputCounts

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550359 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10086 [book] document the HBase canary tool usage in the HBase Book

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550362 13f79535-47bb-0310-9956-ffa450edef68