HBASE-8871  The region server can crash at startup

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1499921 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8867  HLogUtils#getServerNameFromHLogDirectoryName does not take into account the -splitting extension

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1499923 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8729: distributedLogReplay may hang during chained region server failure

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1499925 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HBASE-8584-trunk-gd