quietly_check_login()/confirm_login() calls. Cleans up callsites
(consisting of most of our CGIs), swapping (where appropriate) for calls
to Bugzilla->login. Patch by Teemu Mannermaa <wicked@etlicon.fi>.
r=bbaetz, kiko. a=justdave.
git-svn-id: svn://10.0.0.236/trunk@154331 18797224-902f-48f8-a5cc-f745e15eee43