do-release: take advantage of partial deployment

The 'morph deploy' command now lets us deploy system images one at a
time, so let's do that. This means that if all but one image is
deployed successfully, on the next run the user just needs to deploy
one further image.

Also, since each deployment has a unique name in release.morph now,
we can override the location and VERSION_LABEL fields instead of
requiring the user to update them manually before each release. The
release.morph cluster should now specify the *basename* of the image
in the location field only. By basename, I mean the system name plus
the appropriate extension (normally .tar or .img). The do-release
script will then prepend the image path and the version label to get
a filename.

The release.morph cluster has been updated accordingly.

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