Detect un-cookieable domain confiugration and explode

Summary:
Chrome/Chromium won't set cookies on these domains, at least under
Ubuntu. See T754. Detect brokenness and explode.

Test Plan:
Logged into phabricator as "http://derps/" (failed) and
"http://derps.com/" (worked) in Chromium. Set config to "http://derps/" (config
exploded) and "http://local.aphront.com/" (config OK).

Reviewers: btrahan, jungejason

Reviewed By: btrahan

CC: aran, btrahan

Maniphest Tasks: T754

Differential Revision: https://secure.phabricator.com/D1355