Also moves some common stuff around :
- `api/client/registry.go` for registry related
method (`ElectAuthServer`, …)
- `api/client/credentials.go` to interact with credentials
Migrate logout command to cobra
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: baf467722b3ca9c3beea5d49e26e7982230e7567
Component: engine
