CCBC-265 Do not try to parse config for LCB_TYPE_CLUSTER handles

It fixes timouts for management operations (like 'cbc bucket-create',
'cbc bucket-flush', 'cbc bucket-delete' and 'cbc admin')

Change-Id: I39cda0f6a46001a87fca4dae76c9949b693a1344
Reviewed-on: http://review.couchbase.org/28788
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>