Unset requiretty if it exists in sudoers

Fedora sets requiretty globally by default. This makes sense for
interactive machines with lots of password typing, but is pretty
attrocious for machines that might need users who remotely sudo to do
things. Just remove the setting.

Change-Id: Ic32bd92061a73f854683cc0d2d8919071dabe8cf
Merge "Unset requiretty if it exists in sudoers"