Provision physical machines based on tags/search not just specific names.

Provision physical machines based on tags/search not just specific names.

I would love to see a feature where you can request to provision a physical
machine based on a search query, tags or something similar.

I personally would like to be able to do is something like:
  run_utah_tests.py -m physical --matches NVIDA,HE,dual_monitor -i "$ISO" -p preseed.cfg master.run

So I would imagine (with my limited experience with the Utah codebase) that
there will be the ability to store tag strings against a machine in the db.
i.e. add a 'tags' row to the database that holds the tags that is then used with
a full text search to grab (or not) a machine from said database.

(I simplify of course. I only include implementation details in attempt to
better describe my intentions).

I was also pondering the feature of waiting for the availability of a machine
(with a timeout until failure).
I mention this because in my specific need I might be contending for access to a
pool of machines (which will more than likely be provisioned by other Jenkins
jobs.).

For instance I might have setup a jenkins job that multi-config job that is
setup to run with machine tags=:
  Nvidia, High-end
  Nvidia, Low-end
  Ati, High-end
  Ati, Low-end
  Intel, High-end
  Intel, Low-end
  etc.

So jenkins will attempt to fire up 6+ jobs that is wanting 6+ machines, that may
be already in use by a different job.
It would be a pain to have the job fail when 5 machines succeed after 1.5 hours
and one fail because one machine was unavailable, especially it would have been
available 5 minutes after we started :)

This means that I would like to do something similar to:
  run_utah_tests.py -m physical --matches $tags --wait-for-available -i "$ISO" -p preseed.cfg master.run

So that Utah waits something like 30 minutes or so polling until a machine
matching that tag is available (or otherwise fails).