remove() renamed to rmrf()

Change-Id: I9166fea623694ae01cca9dc4ad07a29cb9e0c480
Reviewed-on: http://review.couchbase.org/31543
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>