Remove libcouchbase stuff

Change-Id: Ic725d3d3b797efd4a273284a4f54cd13156270e4
Reviewed-on: http://review.couchbase.org/28725
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>