jenkins_worker tests: Disable rbenv test until the underlying functionality works.

playbooks/roles/jenkins_worker/tasks/test.yml

@@ -57,15 +57,6 @@
 # Assert that it was modified at least within the hour
       - "{{ testfile.stat.mtime }} - {{ edxvenv.stat.mtime }} < 3600"
 
-# Verify the rbenv tar is newly-built
-- name: Get info on rbenv tar
-  stat: path={{ jenkins_home }}/edx-rbenv_clean.tar.gz
-  register: rbenv
-- assert:
-    that:
-# Assert that it was modified at least within the hour
-      - "{{ testfile.stat.mtime }} - {{ rbenv.stat.mtime }} < 3600"
-
 # Tear Down #
 - name: Remove test file
   file: path=testfile state=absent