HBASE-10213 Add read log size per second metrics for replication source



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1554347 13f79535-47bb-0310-9956-ffa450edef68
Amend HBASE-10213. Spelling fix for method o.a.h.h.replication.regionserver.MetricsSource#incrLogReadInBytes

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1554361 13f79535-47bb-0310-9956-ffa450edef68