Bug 1440094 - Allow `console` as a global for eslint;r=mossop

As of Bug 1425463 it's available in all contexts (including JSM). The following
patche is going to remove imports to Console.jsm, so prepare for this by allowing
it to be used as a global in eslint.

MozReview-Commit-ID: 3gCIspnlVgB

--HG--
extra : rebase_source : 6da75d42d7d937b628ef1d9c0d4e349fd76eda36

tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js

@@ -50,6 +50,7 @@ module.exports = {
     "WebrtcGlobalInformation": false,
     // Non-standard, specific to Firefox.
     "XULElement": false,
+    "console": true,
     "dump": true,
     "openDialog": false,
     "sizeToContent": false,