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
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