Return SHUNNED if status=4

If status=4 , MySQL_HostGroups_Manager::dump_table_mysql_servers() should return SHUNNED
Previous nothing was returned for status=4 (MYSQL_SERVER_STATUS_SHUNNED_REPLICATION_LAG) , caausing the crashing bug #619
dump_table_mysql_servers()

lib/MySQL_HostGroups_Manager.cpp

@@ -476,6 +476,7 @@ void MySQL_HostGroups_Manager::generate_mysql_servers_table() {
 					break;
 				default:
 				case 1:
+				case 4:
 					st=(char *)"SHUNNED";
 					break;
 			}
@@ -516,7 +517,7 @@ SQLite3_result * MySQL_HostGroups_Manager::dump_table_mysql_servers() {
 	int cols=0;
 	int affected_rows=0;
 	SQLite3_result *resultset=NULL;
-	char *query=(char *)"SELECT hostgroup_id, hostname, port, weight, CASE status WHEN 0 THEN \"ONLINE\" WHEN 1 THEN \"SHUNNED\" WHEN 2 THEN \"OFFLINE_SOFT\" WHEN 3 THEN \"OFFLINE_HARD\" END, compression, max_connections, max_replication_lag, use_ssl, max_latency_ms FROM mysql_servers";
+	char *query=(char *)"SELECT hostgroup_id, hostname, port, weight, CASE status WHEN 0 THEN \"ONLINE\" WHEN 1 THEN \"SHUNNED\" WHEN 2 THEN \"OFFLINE_SOFT\" WHEN 3 THEN \"OFFLINE_HARD\" WHEN 4 THEN \"SHUNNED\" END, compression, max_connections, max_replication_lag, use_ssl, max_latency_ms FROM mysql_servers";
 	proxy_debug(PROXY_DEBUG_MYSQL_CONNPOOL, 4, "%s\n", query);
 	mydb->execute_statement(query, &error , &cols , &affected_rows , &resultset);
 	wrunlock();