Revert "Add GC of layers in Clair"

This reverts 49872838ab

test/test_secscan.py

@@ -547,19 +547,6 @@ class TestSecurityScanner(unittest.TestCase):
     notification = model.notification.create_repo_notification(repo, 'vulnerability_found', 'quay_notification', {}, {'level': 0})
     self.assertFalse(VulnerabilityFoundEvent().should_perform(event_data, notification))
 
-  def test_garbage_collection(self):
-    requests_made = set()
-
-    @urlmatch(netloc=r'(.*\.)?mockclairservice', path=r'/v1/layers/(.+)')
-    def delete_layer(url, request):
-      requests_made.add(request.method)
-
-    with HTTMock(delete_layer):
-      # Purge a repository.
-      model.repository.purge_repository('devtable', 'simple')
-
-    # Ensure that DELETE is called (and only DELETE) for the layers in the security scanner.
-    self.assertEquals(set(['DELETE']), requests_made)
 
   def test_notification_worker(self):
     pages_called = []