This replaces the eslintvalidate hooks with an error message
prompting the user to upgrade to tools/lint/hooks.py.
The reasons for deprecating eslintvalidate are twofold:
1) It only runs eslint, so developers might miss errors from
other linters.
2) It isn't as well maintained, and I've started to see
reports of problems in the wild. It doesn't make sense to
maintain two sets of hooks that do the same thing.
MozReview-Commit-ID: CseeVIof2om
--HG--
extra : rebase_source : e859c368d14cd1bf7e7d85f0de5bbb89e88402d9
