Finalize ssh configuration

For added security, ssh_config only enables Kerberos ticket delegation for
hosts with the same DNS domain.
Don't discriminate non-graphical logins

Currently, if a session is started where the PAM_SERVICE is not lightdm, no
desktop shortcuts are created. This causes problems when starting an X session
manually from the command line or over an SSH connection, so now that
restriction has been removed and desktop shortcuts are created regardless.