Embed bbolt command as etcdutl subcommand #15760

What would you like to be added?

Embed bbolt command as etcdutl subcommand. Options for names:

• etcdutl bbolt
• etcdutl db

Why is this needed?

Improves user experience

• easier access
• etcd documentation could start recommending using bbolt commands without requiring users to learn bbolt

Downsides:

• Might require rewrite to make commands compatible
• Binds to command interface in other project