HBASE=9732 Static AtomicLong updated in StoreFileScanner every (re)seek

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1530766 13f79535-47bb-0310-9956-ffa450edef68
HBASE=9731 updatesBlockedSeconds RegionServer metric should not be a histogram

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1530769 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd
Merge remote branch 'origin/0.94-gd' into fb-HBASE-8584-0.94-gd