fix cleanup of ul container
fix cleanup of ul container

Change-Id: Ifff872af3cd63e1ed488ad12f4562842b5a9c7d5
Reviewed-on: http://review.couchbase.org/23776
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

mikewied/cbagent,pavel-paulau/cbagent,vmx/cbagent,ronniedada/litmus,couchbase/cbagent,ronniedada/litmus,couchbase/cbmonitor,couchbase/cbmonitor