Add network barclamp back.
Fix up test_lib to look for kvm and qemu-kvm
Make barclamp_install understand and respect barclamp requires when calculating the install order.
Add the required chef roles to bring the provisioner up.

This lets us pretend we have a functional admin node for testing.
Oops, need to set candidates.force_install instead of force_install.
Merge pull request #1721 from VictorLowther/pull-req-master-b4a5d683f0e2f729f8e7cc489c8f4afaac0e6fac

Merged by devtool for VictorLowther