Remove unused loggers

Change-Id: Ifb80b7eefb53ed6ef714f1bc0df27360dd616c0d
Reviewed-on: http://review.couchbase.org/25845
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>