Fix bash completion for service env, mounts and labels
Fix bash completion for service env, mounts and labels

`service create` and `service update` both used to have `--env`, `--label`
and `--mount` options.
These options now are only valid for `service create`.
`service update` got corresponding `--xxx-add|rm` options instead.

Signed-off-by: Harald Albers <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@albersweb.de>

cpuguy83/cli,thaJeztah/cli,cpuguy83/cli,docker/cli,dnephin/cli,thaJeztah/cli,dnephin/cli,docker/cli