Renable user_test on travis after 2365a72d98 fix

.travis.yml

@@ -80,7 +80,7 @@ before_script:
 # set module exclusions. --exclude=TestUser because of older version of mock
 # without configure_mock
  - export EXCLUDE="--exclude=TestcaseGenerator --exclude=vcard
-   --exclude=merge_ref_test --exclude=user_test"
+   --exclude=merge_ref_test"
 # set GRAMPS_RESOURCES for locale, data,image and documentation
  - export GRAMPS_RESOURCES=.