CBQE-0: fix cbrecovery task stuck

fix related to change https://github.com/couchbase/testrunner/commit/f05efd2ba5b8d21bc84812ed4dd7665e1eee3d41#diff-2e91d9902d4b7570af538b825b803e93L2821

http://qa.hq.northscale.net/job/ubuntu_x64--38_01--cbrecovery-P1/4/console

Change-Id: I363bd5c8d87671985a25d70cdaa93268bdef69fb
Reviewed-on: http://review.couchbase.org/37796
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: buildbot <build@couchbase.com>