Travis Ci changed the infrastructure, leading
to failures in our memcache tests.

Disable the tests until we figured out the exact problem

Change-Id: I641af27a2253b8abe478dd3b97635a222a713e6e
Reviewed-on: http://review.typo3.org/15521
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel