Missing import.
	modified:   api/machine.py
Fix machine list API endpoint.

* Fix method signature.
* Raise 500 error and use failure_response when there is an error instead of invalid_creds.

	modified:   api/machine.py
Fix method signature.

* Add missing parameter as keyword.
* Fix spelling in debug log.

	modified:   service/tasks/driver.py
Change provider location name hard-coded in script to point to our default provider.
	modified:   scripts/add_openstack_user.py
PEP8 Compliance.

	modified:   core/models/instance.py
Merge branch 'abyssinian-nightjar' of github.com:iPlantCollaborativeOpenSource/atmosphere into abyssinian-nightjar