CBQE-1902: print UI Logs if CBRecoveryTask failed

Change-Id: I1c6ecd303f7d12dff418a2312bbbfebd0a05b5c8
Reviewed-on: http://review.couchbase.org/33250
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>