feat(occ): allow admins to clear account passwords

[leftybournes]

Summary

This adds the --no-password option to occ user:resetpassword to allow admins to clear users' passwords through the command line.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[provokateurin]

LGTM, but what happens if a user has no password set?

[leftybournes]

LGTM, but what happens if a user has no password set?

Good point. I should add a check for that.

Edit: Answer: It unconditionally sets it to a blank string, and the password field gets a hash.

[leftybournes]

LGTM, but what happens if a user has no password set?

So it seems like server is designed to generate a random password anyway if only an e-mail address is given when creating a user. I wonder if it's better to add a confirmation question and just empty the password regardless when confirmed.