MINOR: obj: Add a new type of object, OBJ_TYPE_SRVRQ.

dns_srvrq will be objects used for dealing with SRV records.
diff --git a/include/types/obj_type.h b/include/types/obj_type.h
index 83a3e78..a6310cf 100644
--- a/include/types/obj_type.h
+++ b/include/types/obj_type.h
@@ -39,6 +39,7 @@
 	OBJ_TYPE_APPLET,       /* object is a struct applet */
 	OBJ_TYPE_APPCTX,       /* object is a struct appctx */
 	OBJ_TYPE_CONN,         /* object is a struct connection */
+	OBJ_TYPE_SRVRQ,        /* object is a struct dns_srvrq */
 	OBJ_TYPE_ENTRIES       /* last one : number of entries */
 } __attribute__((packed)) ;