HBASE-9167 ServerCallable retries just once if timeout is not integer.max

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1515874 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8760 possible loss of data in snapshot taken after region split

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1515967 13f79535-47bb-0310-9956-ffa450edef68