Make --generate-only also take --offline optionally

[jaekwon]

The bug

The instructions here are broken: https://hub.cosmos.network/docs/delegator-guide-cli.html#signing-transactions-from-an-offline-computer
Running the above gives error ERROR: cannot estimate gas with generate-only

The feature

From Bez:

The generate only flag currently is dual purpose — to generate a tx only and not broadcast it and to also be completely offline while doing so. It’ll probably be a UX improvement if we introduce two distinct flags — generate only and offline.

[jgimeno]

https://hub.cosmos.network/master/delegators/delegator-guide-cli.html#signing-transactions-from-an-offline-computer

Updated link.

[alessio]

@jgimeno I'm glad you're getting on with this! I'll dump here some context of conversations that we had in the past:

• Enable simple CLI offline mode to disable querying node & request parameters #3720
• generate-only still requires node access #4305

(note that there might be more PRs/issues)

Plus:

In short:

• offline should cut connectivity off
• generate-only should just disable access to keyring

Most importantly, the two modes should be orthogonal, e.g. neither of them shoud imply the other one.