Add templates for all the quantum agents.

We were not generating ini files for any of the quantum agents,
and we need to in order to ensure that they don't use the
distro-provided default ones.

While we are at it, we need the quantum metadata agent as well.
Make sure libvirt's dnsmasqs don;t ruin our party.
Tighten check on finding the quantum rootwrap binary
Centralize where we have Quantum create the bridges it needs.

Since every node that runs a Quantum service needs to include this
recipe, it is the obvious place to put our bridge manipulation.
Merge pull request #24 from VictorLowther/pull-req-release-pebbles-master-3389d694213927e08a04b5f240268c74f5d0a4f9

Smooth out how nova nd quantum interact. [2/2]