Remove popularity-contest and packages that depend on it.

This is to address the issue of installation-unique data
making it to the image.
Execute partition resizing setup code earlier (so lower level items execute first).
Move hostname setup items closer to low-level stuff.
Rename horde-hostname to horde-startup.

This is to facilitate additional first-boot tasks.
Rename horde-hostname to horde-startup, pt. 2.
Reboot the box immediately after host name is changed.
Switch and print reboot message to /dev/tty2.

Changing host-name at boot-up may cause issues with lightdm startup
due to race between hostname change and X11 startup.
It's possible for the X server to start before hostname is changed;
server then expects clients to authenticate from old host name while
clients (typically, the greeter) are connecting using new host name.

Unfortunately, it's not possible to serialize hostname change and
lightdm startup without touching /etc/init/lightdm (which can,
hypothetically, be upgraded). For that reason, the best currently
known mitigation technique is rebooting the box as soon as host name
is changed.