Fixed wsrep replaying for stored procedures (#1256)

- Changed replaying to always allocate a separate THD object
  for applying log events. This is to avoid tampering original
  THD state during replay process.
- Return success from sp_instr_stmt::exec_core() if replaying
  succeeds.
- Do not push warnings/errors into diagnostics area if the
  transaction must be replayed. This is to avoid reporting
  transient errors to the client.

Added two tests galera_sp_bf_abort, galera_sp_insert_parallel.
Wsrep-lib position updated.

sql/sql_class.cc

@@ -1020,6 +1020,15 @@ Sql_condition* THD::raise_condition(uint sql_errno,
   if (!(variables.option_bits & OPTION_SQL_NOTES) &&
       (level == Sql_condition::WARN_LEVEL_NOTE))
     DBUG_RETURN(NULL);
+#ifdef WITH_WSREP
+  /*
+    Suppress warnings/errors if the wsrep THD is going to replay. The
+    deadlock/interrupted errors may be transitient and should not be
+    reported to the client.
+  */
+  if (wsrep_must_replay(this))
+    DBUG_RETURN(NULL);
+#endif /* WITH_WSREP */
 
   da->opt_clear_warning_info(query_id);