Issues with new admin tool

[mcpherrinm]

I've been testing out the new admin tool and have the following quality-of-life problems:

Some are relatively straightforward tool fixes:

• admin tool output improvements #7358
• admin revoke-cert serial number format isn't validated in -dry-run=true #7357
• admin block-key failed #7460

Some are a bit gnarlier:

• In the admin tool, -dry-run=false can't be at the end of the command #7359
• Allow specifying an account for admin update-email #7355
• admin 's clearEmail misses email addresses #7292

[mcpherrinm]

I dumped thoughts into one ticket here, but I'm going to split a few out into their own for sharing them

[aarongable]

Feel free to use GitHub's magic "Convert to issue" button to get auto-linking between these checklist items and the new bugs.

[mcpherrinm]

oh I had no idea that existed, thank you!

[jcjones]

Added #7292 to this meta-list