Rename `vcloud-configure-edge` executable

Rename the CLI command `vcloud-configure-edge` to
`vcloud-edge-configure` to make the naming consistent with the other
vCloud Tools using the format:

  vcloud-<entity>-<infinitive-verb>

Per the discussion in Pivotal: 67302952.

Leave the original executable in place with a deprecation warning and
update the CHANGELOG accordingly.