Revert "memcg: enable accounting for file lock caches (bsc#1190115)."
    
    This reverts commit 912b4421a3e9bb9f0ef1aadc64a436666259bd4d.
    
    It's effectively upstream commit
    3754707bcc3e190e5dadc978d172b61e809cb3bd applied to kernel-source (to
    avoid proliferation of patches). Make a note in blacklist.conf too.