Add a bin/auth revoke revoker for sessions

Summary: Ref T13043. Allows CLI revocation of login sessions.

Test Plan: Used bin/auth revoke --type session with --from and --everywhere to revoke sessions. Saw accounts get logged out in web UI.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13043

Differential Revision: https://secure.phabricator.com/D18892