Summary: I don't feel that this linter rule belongs in the `ArcanistTextLinter`. In fact, this linter rule is quite similar to the rules provided by `ArcanistGeneratedLinter` and `ArcanistNoLintLinter` and these classes could possibly be consolidated. I have moved this linter rule to a standalone `ArcanistCommitLinter` class (which could possibly do additional lints in the future).
Test Plan: Moved existing test cases.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D10473
