switch xud to temp-yy branch

Author: reliveyy

images/xud/src.py

@@ -14,6 +14,6 @@ def get_build_args(self, version):
     def get_ref(self, version):
         if version == "latest":
             # change "master" to a another xud branch for testing
-            return "master"
+            return "temp-yy"
         else:
             return "v" + version