Use the renamed deploy-baremetal element

This is dependent upon a change in diskimage-builder:
Ibb4026e8fc8ba6378061461c4796a91ab2fa991f

The rename was performed so that each element had a more descriptive
name, and so that each element could accurately set an element-provides
of "deploy", given that the elements enable tripleo deploys via the
ramdisk image.

Change-Id: I1ff4bb98c99dfe87ccc4fb19767b93e27707d3a7
Merge "Use the renamed deploy-baremetal element"