Add ostree.write deployment extension3-add-support-for-ostree-deployment

Reverts commit 36f7e4923ae5d03dd345d74f7fcade48c99a498d

This is a simple deployment extension to write the results of a Baserock
build to an OSTree repo.

See ostree.write.help for more information.

The Baserock reference systems contain static device nodes, which are
not supported by OSTree, and are obsolete on Linux systems. To work
around this problem, I added a strip-device-nodes.configure extension.
The systems should still work the same as devtmpfs will create the
device nodes.

I've tested this by deploying minimal-system-x86_64 to an OSTree repo,
then checking it out into a temporary directory, creating a read-only
bind-mount of the temporary directory and chrooting then into it.

This is only going to be useful for containers systems and chroots for
the time being. We would need to make some quite major changes to the
Baserock reference systems to enable deployment to VMs or bare metal
using OSTree.

Change-Id: Ic393bdec7b28341fc5dfa56bb684217d964be5ff

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