* HBASE-25379 Make retry pause time configurable for regionserver short operation RPC (reportRegionStateTransition/reportProcedureDone) * HBASE-25379 RemoteProcedureResultReporter also should retry after the configured pause time * Addressed the review comments Signed-off-by: Yulin Niu <niuyulin@apache.org> (cherry picked from commit c96fbf04077fa37555033f88939fdd69ac810b35)