Fixup observe test failure

Change-Id: Ib10d39ab9bb8a85706189f8d88e94ce56b20fee9
Reviewed-on: http://review.couchbase.org/29202
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>