fix(configs): Remove PAM and cleanup sshd config for usr
fix(configs): Remove PAM and cleanup sshd config for usr

Remove any options that match system defaults or were only applicable to
using PAM. Add UsePrivilegeSeparation which is usually enabled in Gentoo.

crawford/init,zhang0137/init,nicescale/init,coreos/init,crawford/init,endocode/init,zhang0137/init,coreos/init,BugRoger/init,coreos/init,endocode/init,nicescale/init,BugRoger/init