Don't use repo for clean-xfd

Change-Id: I8aa571e603ba05f185fea9cd65d27bc3def0e976
Reviewed-on: http://review.couchbase.org/35356
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>