Use provides to note an element provides deploy

Use "deploy" to denote that an element provides the deploy
capability for a ramdisk for tripleo installation purposes.

This will be a 3-part change to enable renaming deploy to
deploy-baremetal so that the generic "deploy" capability can
be used for the provides file, as a dependant change will have to
be made in tripleo-incubator.

The tripleo-incubator change is
I1ff4bb98c99dfe87ccc4fb19767b93e27707d3a7 and that swaps to using
deploy-baremetal in place of deploy for ramdisk creation when using
baremetal.

Change-Id: Ibb4026e8fc8ba6378061461c4796a91ab2fa991f
Merge "Use provides to note an element provides deploy"