R1:1fc0c3b1e849

Add installation check for dot in domain.

Summary: Add installation check for a dot in the domain, which is necessary for some browsers to set cookies.

Test Plan: Restart web server to force the setup procedures to run again.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4710