Handle the paginatiion for image list.  We were sorting the
data here, so nothing lost for the generator.

Change-Id: I2d7d4b3d5c9f650953f309c971ac53b64f6f7f77

In several places we had else branches where a reasonable default
would do the job. This makes the code a mean cleaer and easier to
read.

Change-Id: I231e09aab85fd32b8300bc33c48d0899b728b96e

Change-Id: I4c8b93ede80f993eab8badfbba6bf1c530844d54

This adds a new option --os-cloud that allows the configuration values
for multiple clouds to be stored in a local file and selected with
a single option.

Internal option names have had 'os_' removed to be comptible with
the options returned from OpenStackConfig().get_one_cloud().

The config file is ~/.config/openstack/clouds.yaml:

Sample
------
clouds:
  devstack:
    auth:
      auth_url: http://192.168.122.10:35357/
      project_name: demo
      username: demo
      password: 0penstack
    region_name: RegionOne
  devstack:
     auth:
       auth_url: http://192.168.122.10:35357/
       project_name: demo
       username: demo
       password: 0penstack
     region_name: RegionOne

Co-Authored-By: Monty Taylor <mordred@inaugust.com>
Change-Id: I4939acf8067e44ffe06a2e26fc28f1adf8985b7d
Depends-On: I45e2550af58aee616ca168d20a557077beeab007