Remove calls to getCallsign() from repository daemons
Summary: Ref T4245. These are all descriptive or UI-facing.
Test Plan:
- Ran bin/repository pull ... with various identifiers.
- Ran bin/repository mirror ... with various identifiers.
- Ran bin/repository discover ... with various identifiers.
- Ran bin/phd debug pull X Y --not Z with various identifiers.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T4245
Differential Revision: https://secure.phabricator.com/D14926