Add installing go on the vm's

Change-Id: I8085bd97bca2377d3526f6b4c7b77aaac61aeda1
Reviewed-on: http://review.couchbase.org/42924
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>