Revert to 2gb memstick size to make upgrades work.

We need web upgrades to work.  For now revert
to a smaller size memstick until we can make the
upgrader bounce the image size.
Turn off caching packages into /usr/local/share/warden/packages

This should shrink our image down by enough to revert back
to a 2gb memstick.
Make installer very verbose.

pipe the GUI installer into /var/log/messages.

we use a fifo here and run logger(1) on the
otherside so that as much of the install
as possible is logged to /var/log/messages.
Fix GUI upgrades by including root/update in GUI image.

Revision d3477b6 changed the way we call /root/update
such that it is no longer compatible with old versions of FreeNAS.

To fix this we include the /root/update scripts inside the
GUI image and directly invoke those instead.