HBASE-9792 Region states should update last assignments when a region is opened

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1539728 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8741 Scope sequenceid to the region rather than regionserver (WAS: Mutations on Regions in recovery mode might have same sequenceIDs)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1539743 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9909 TestHFilePerformance should not be a unit test, but a tool

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1539766 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd