Summary:
Ref T13109. Make it slightly more clear what the scope of the write and read locks are, and slightly more clear that we're actively acquiring locks, not just sitting around waiting.
While waiting on another writer, show who we're waiting on so you can walk over to their desk and glare at them.
Test Plan:
Added `sleep(15)` after `willWrite()`. Pushed in two windows. Saw new, more informative messages. In the second window, saw the new guidance:
> # Waiting for hector to finish writing (on device "repo1.local.phacility.net" for 11s)...
Reviewers: asherkin
Reviewed By: asherkin
Subscribers: asherkin
Maniphest Tasks: T13109
Differential Revision: https://secure.phabricator.com/D19247
859b274970