workaround upr control parsing bug in ep-engine

I'm too eager to get R16 tested so I want this in even if ep-engine
side should be easy and quick to fix too.

Change-Id: Idc7f0a07d7ecbe434bbbdb3ff7e2ae9511533d44
Reviewed-on: http://review.couchbase.org/37347
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>