Added missing args check in commands

[kanha-gupta]

Description

Added missing args check in following commands :

1. container-registry credentials docker
2. kubernetes list, kubernetes start
3. database user list, database topic list, database quota list

Related Issues

Fixes #498
Fixes #497

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[github-actions]

Unit Tests and Coverage

Show Output

	github.com/vultr/vultr-cli/v3		coverage: 0.0% of statements

Pusher: @kanha-gupta, Action: pull_request_target