deploy: Finish off the Btrfs system layout implementation

The shared state directories defined in writeexts.py (/var, /home etc.)
are now separate Btrfs subvolumes that are mounted in place using fstab.

There are some warnings on mounting /var and /srv about the mountpoint
not being empty. Not yet investigated.

If a configure extension has already added / to the fstab, use the
device it chose rather than assuming /dev/sda. This is required for the
vdaboot.configure extension that we use for OpenStack deployments.
Similarly, if a configure extension has added an entry for a state
directory in /etc/fstab already, we don't replace it with a /state/xxx
directory. That's only done as a default behaviour.

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