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.
Return with exit code of 1

Return an exit code of 1 to indicate that the command did not execute
successfully as this command is now deprecated.
Make deprecation error more concise
Update README following command rename

In 9373df9cf73845843bd9b6e8e2fbd9c119f645f6, the `vcloud-configure-edge`
command was renamed to `vcloud-edge-configure`. Update the README to
reflect this.
Version 1.0.0

Release version 1.0.0 now that we've added most of the functionality we
need, stabilised, and are introducing some breaking changes (binary
rename).
Merge pull request #82 from alphagov/67302952-rename-bin

[Implements #67302952, #72612200] Rename `vcloud-configure-edge` executable and release version 1.0.0