Set unit test's git username and email
Set unit test's git username and email

Summary: This is necessary for circleci which doesn't have a default username and email for git.

Reviewers: oathkeeper, asbrown

Reviewed By: asbrown

Subscribers: oathkeeper

Differential Revision: https://phab.corp.nextdoor.com/D11322

Nextdoor/buckle,Nextdoor/buckle