HBASE-9977 Define C interface of HBase Client Asynchronous APIs

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1555272 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10210 during master startup, RS can be you-are-dead-ed by master in error

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1555275 13f79535-47bb-0310-9956-ffa450edef68