[openstack] validate API access
[openstack] Verify large volumes can be created

Includes specific changes for devstack localrc
[openstack] determine if API throttling enabled

Provides suggestion for how to disable throttling on
devstack.
[openstack] verify internet connection within vms
[openstack] verify & create flavors with ephemeral disk
Merge pull request #113 from drnic/openstack

Verify your OpenStack