Update oslo-incubator apiclient.exceptions module

Changes -
 * Fix usage of dict.keys in apiclient.exceptions

Change-Id: I495fa4f7483de693932f505275b1fa73f0790bea
Update oslo-incubator cliutils module

Changes -
 * Use `six.text_type` instead of `str` in cliutils
 * py3kcompat: remove
 * Correct docstring in load_plugin_from_args
 * Removed set_loaded() method from Resource class
 * Add to_dict() method to apiclient Resource
 * Deleted duplicated method in cliutils.

Change-Id: I87fb4928d5d3e62a2a609f6f5073b3331088ee27
Merge "Update oslo-incubator apiclient.exceptions module"
Merge "Update oslo-incubator cliutils module"