Git integration test: remove test for ambiguous .git/branches dir

- '.git/branches' does not always exist, but the git integration
  tests always checks for this directory's existence so it always
  fails
- more info:
  - http://stackoverflow.com/questions/10398225/what-is-the-git-branches-folder-used-for

test/integration/roles/test_git/tasks/main.yml

@@ -65,16 +65,11 @@
   stat: path={{ checkout_dir }}/.git/HEAD
   register: head
 
-- name: check for remotes
-  stat: path={{ checkout_dir }}/.git/branches
-  register: branches
-
 - name: assert presence of tags/trunk/branches
   assert:
     that:
       - "tags.stat.isdir"
       - "head.stat.isreg"
-      - "branches.stat.isdir"
 
 - name: verify on a reclone things are marked unchanged
   assert: