Fixed failing test cases and compiler warnings found by buildbot

- Added some extra command to rpl_start_stop to ensure that the
  IO thread has connected to the master before we shut down the server.
- if signal returns signalhandler_t, use this with the alarm code
- Added missing tests to sys_vars
- Fixed some possible overflow bugs in tabxml.cpp

storage/connect/ha_connect.cc

@@ -2483,6 +2483,8 @@ PFIL ha_connect::CondFilter(PGLOBAL g, Item *cond)
 				case MYSQL_TYPE_YEAR:
 				case MYSQL_TYPE_NEWDATE:
 					return NULL;
+                                default:
+                                  break;
 				} // endswitch type
 
 				if (trace) {