Remove a diagnostic.

constfunc_test.py had been edited on the travis test branch to produce
some diagnostics, and travis.yml was edited to omit the diagnostics.

.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=constfunc_test.py"
+   --exclude=merge_ref_test --exclude=user_test"
 # set GRAMPS_RESOURCES for locale, data,image and documentation
  - export GRAMPS_RESOURCES=.