A simple standalone test for in-band inspection

Redfish is chosen because it is virtually guaranteed to support managed
inspection, unlike IPMI which may require a separate PXE setup.

Adds support for setting enabled interfaces, which is already relied
upon by the iDRAC tests but is not actually implemented.

Depends-On: https://review.opendev.org/c/openstack/ironic/+/927265
Change-Id: Ib66ac41c2919bade7c0c1ca3d8bb4fdfd2acf858
5 files changed