Move LINT_NO_COMMIT from ArcanistTextLinter to a new linter

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