This adds the ability to manage the securetty file.
By allowing management of securetty, operators can limit root
console access and improve security through hardening.
Change-Id: I0767c9529b40a721ebce1eadc2dea263e0a5d4d7
Partial-Bug: #1665042
Depends-On: Ic4647fb823bd112648c5b8d102913baa8b4dac1c