Move moxi to cmake

Change-Id: I8a9798d9b893dccaa6d36f38538586384d78dc99
Reviewed-on: http://review.couchbase.org/32329
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Reviewed-by: Nimish Gupta <nimish@couchbase.com>
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>