Clean up properties (metadata) formatting

* Reformat default dict output to key='value' using utils.format_dict()
* Changes utils.get_item_properties() to pass the specific field to
  the formatter function rather than the entire resource object, this
  allows the formatter to handle multiple attributes.
* Updates server, volume, volume type commands

Change-Id: I90eebf6b84ae200532f09cd925f371598ea54a64
More metadata -> properties cleanups

Change-Id: If73ed373f58bdca6fc9a1e688def7daf96d22a65
Complete Image v1

* Add v1 versions of image delete, list, save, set, show
* Change default Image API to v1

Rebased for https://review.openstack.org/#/c/36772/

Change-Id: Ie2bfe660aac8a0fcf651c67fd1ea4842e76ce377
Merge branch 'image-v1' into dt-test
Merge branch 'aggregate-commands' into dt-test
Merge branch 'quota-commands' into dt-test
Merge branch 'metadata-format' into dt-test
Merge branch 'volume-keystone' into dt-test