Remove baremetal virt driver

This patch removes the baremetal virt driver from nova, which was
deprecated in Juno. It does not aim to perform any of the refactoring
we need to do now that the driver is gone, but is intended as a clean
removal of all the baremetal code itself.

Of specific note are the api_samples tests. We didn't have samples to
test the ironic proxy code, so I removed the baremetal ones for show
and index, resetting that extension back to "untested" status as if it
was new.

Tests that stub out ironic interactions and re-introduce those tests
should be added after this patch.

Change-Id: Ia76e41a8a3b7230701872ae7a1975edc3d9ea847
Merge "Remove baremetal virt driver"