Merge pull request #25 from lucas-akira/TCB-477

registryops: Fix --login-to arg behavior when using default registry

tcbuilder/backend/registryops.py

@@ -339,7 +339,7 @@ def _setup_credentials(self):
                     self.login = (username, password)
             elif len(_login) == 3:
                 reg, username, password = _login
-                if reg == self.registry:
+                if (reg == self.registry) or (reg == DEFAULT_REGISTRY):
                     self.login = (username, password)
             else:
                 assert False, "Unhandled condition in _setup_credentials()"