upgrade-ironic: Do not source lib/baremetal
upgrade-ironic: Do not source lib/baremetal

nova-baremetal support was dropped from devstack, this removes
a reference that is blocking ironic pullup testing.

Change-Id: I582ddc6024bca9b9f369c544c03848ea7d23c275

dtroyer/grenade,openstack-dev/grenade,dtroyer/grenade,openstack-dev/grenade