Description
Current metakv implementation isn't handling the cas or revision value correctly during GET/SET operations.
Needs to fix this.
https://github.com/couchbase/cbgt/blob/master/cfg_metakv.go#L184
https://github.com/couchbase/cbgt/blob/master/cfg_metakv.go#L220
Also, needs to handle this correctly for node definitions and plan pindexes.