* origin/pr/48:
Allow to provide customized DispVM home directly in the template VM
This allows to put a customized DispVM home directly in /home_volatile
in the template instead of placing it in the -dvm internal AppVM.
This significantly speeds up DispVM startup for large customized homes,
since none of the home data has to be copied out from saved_cows.tar to
volatile.img, and instead CoW is used.
It's not a very user friendly or discoverable solution, but it only
takes a few lines of code, and so seems a reasonable stopgap until a
much more complex solution with copy-on-write for the private.img is
written.
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