Patch By Max Kanat-Alexander <mkanat@bugzilla.org> r=LpSolit, a=justdave

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.

Contributed by Andreas Höfler <andreas.hoefler@bearingpoint.com>
a= justdave