[initscripts]: Add SELinux relabeling functions to common script functions.
[initramfs-xenclient]: On firstboot relabel the boot partition in the initramfs.

The first stuff that's run after the pivot (where the selinux policy
is loaded) require that the boot partition be labeled properly. This
is init.root-ro etc.
[xenclient-dom0-initscripts]: Relabel remaining rw mounts in mountall.sh on firstboot.
[xenclient-dom0-tweaks]: Remvoe autorelabel script.

This script doesn't fit well into the "embedded" model of OpenXT.
The problem this script is intended to solve (relabeling file systems)
should only be done OpenXT at the time of the firstboot.
[xenclient-root-ro]: Relabel r/w mounts on firstboot for measured firstboot path.
[xenclient-config-access]: Relabel /config on firstboot.
[xenclient-dom0-tweaks]: Make SELinux file labeling more targeted in firstboot.sh

Now that the bulk relabeling of the persistent volumes is handled
closer to where they're mounted the firstboot script can be more
targeted. This should make the first boot path a bit faster and the
firstboot script a bit more clean.