R1:2b3d3cf7e4c0

Enforce that global locks have keys shorter than 64 characters

Summary:
Fixes T7484. There's a bunch of spooky mystery here but the current behavior can probably cause problems in at least some situations.

Also moves a couple callsigns to monograms (see T4245).

Test Plan:
- Faked a short lock length to hit the exception.
- Updated normally.
- Grepped for other use sites, none seemed suspicious or likely to overflow the lock length.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley…