MXS-1295: Add strict_sp_calls parameter

The new parameter allows the session to be "locked" to the master server
after a stored procedure is called. This will keep the session state
consistent if the stored procedure call modifies the state of the session.

server/modules/routing/readwritesplit/rwsplit_tmp_table_multi.c

@@ -355,6 +355,11 @@ bool check_for_multi_stmt(GWBUF *buf, void *protocol, mysql_server_cmd_t packet_
     return rval;
 }
 
+bool check_for_sp_call(GWBUF *buf, mysql_server_cmd_t packet_type)
+{
+    return packet_type == MYSQL_COM_QUERY && qc_get_operation(buf) == QUERY_OP_CALL;
+}
+
 /**
  * @brief Determine the type of a query
  *