Fix OS-DCF:diskconfig XML handling

Removes string to bool conversion for the OS-DCF:diskconfig
attribute during XML deserialising as the diskconfig extension
expects a string (MANUAL or AUTO) not a bool.

Fixes bug 1152439

Change-Id: Id9a5c2559a2891c2a21c437c9a5a534b9885c9bf
Drop gzip flag from tar command for OVF archives

Fixes bug 1154253

Change-Id: I3880d9b187dc25d2ff44fe502eec4d1e0bce4218
Merge "Fix OS-DCF:diskconfig XML handling"
Merge "Drop gzip flag from tar command for OVF archives"
Adds the Scheduled Images extension.

Includes the Scheduled Images extension extension.
Changed the test_scheduled_images.py
Working unit test test_show_server

in file nova/tests/api/openstack/compute/contrib/test_scheduled_images.py
Cleaned up more tests in test_scheduled_images.py
all unit tests passing except restricted by project
extension unit tests passing
Cleaned up pip errors and Comments
Changed ext to use Tenant name istead of ID
_create_image_schedule includes server_id