Code review comment for lp:~rhansen/lightdm/multiseat

1) Option to set VT number? I don't see any need for it.
2) Auto add -sharevts for all seats except seat0. But this is not big problem as it can be added in configuration file.

My lightdm.conf:
[SeatDefaults]
user-session=ubuntu
greeter-session=unity-greeter

[Seat:0]
xdg-seat=seat0
xserver-command=/usr/bin/X -core -config xorg-seat0.conf -layout seat0 -s 120

[Seat:1]
xdg-seat=seat1
xserver-command=/usr/bin/X -core -config xorg-seat1.conf -layout seat1 -s 120 -sharevts