Temporarily restore apache/license linters

Summary:
Restores linters only, without unit tests or entry in ComprehensiveLinter. Marks them deprecated.

If use at Facebook isn't widespread I'd prefer to simply delete them.

Test Plan: none

Reviewers: vrana

Reviewed By: vrana

CC: aran

Maniphest Tasks: T2274

Differential Revision: https://secure.phabricator.com/D4906