The ironic-inspector service has been replaced by built-in in-band
inspection in ironic [1].
This change disables and removes enough code to allow CI tests to pass.
Migration to the built-in in-band inspection will be done separately.
[1] https://docs.openstack.org/ironic/latest/admin/inspection/migration.html
Change-Id: I8caa8ea763fe5aee9d356850378db770cdbf2ccd
Signed-off-by: Pierre Riteau <pierre@stackhpc.com>