fix(client): concatenate strings together

Author: Matthew Fisher

client/deis.py

@@ -715,7 +715,7 @@ def auth_register(self, args):
             if self.auth_login(login_args) is False:
                 self._logger.info('Login failed')
         else:
-            self._logger.info('Registration failed', response.content)
+            self._logger.info('Registration failed: ' + response.content)
             sys.exit(1)
         return True