* add db interface and methods, add sa metainfo endpoints and svc
* add bucket metainfo svc funcs
* add sadb bucekts
* bucket list gets all buckets
* filter buckets list on macaroon restrictions
* update pb cipher suite to be enum
* add conversion funcs
* updates per comments
* bucket settings should say default
* add direction to list buckets, add tests
* fix test bucket names
* lint err
* only support forward direction
* add comments
* minor refactoring
* make sure list up to limit
* update test
* update protolock file
* fix lint
* change per PR
