* Allows `run_volume_tags` to be set without requiring a major rewrite
of the (common) amazon builder code used to start an instance.
The common start up code tags the instance and *all attached volumes
at creation*. If `run_volume_tags` are set this means that any volumes
specified in `ebs_volumes` will *initially* be tagged with the
`run_volume_tags` rather than the tags set in the `ebs_volumes`
section
* Once the instance is reported to be 'ready' the step to tag the EBS
volumes is run. Once complete all volumes should have the tags
requested by the user:
* Volumes associated with the source instance should be tagged with
the tags set in `run_volume_tags` (if any)
* Each EBS volumes specified in the `ebs_volumes` section of the
template should only be tagged with its associated tags (if any)
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