Do not filter image list from glance api

Horizon filter glance image list because 'aki', 'ari' type of images
can not be launchable.

However, it is better to provide full capacity with glance in
Horizon.

Reasons:
1. Horizon allow upload those images. It brings confusion if not
show them
2. The filtering strange behavior when pagination is enabled

Changed to show all images in Horizon, but 'aki', 'ari' type of
images are not allowed to launch or create volume.

Change-Id: Ic92fc97d7327bb2525c0155646487dd685e99c79
Closes-Bug: #1257180
Empty files shouldn't contain copyright nor license

http://docs.openstack.org/developer/hacking/#openstack-licensing

Change-Id: Idd2d85507e9a518126b0bd6e3c814c650622adaf
Closes-Bug: #1262424
Make download an action rather than a column

Removed download column.
Created download action that uses containers object_download url.
Fixed spelling of datum in existing action.

Closes-Bug: #1250584
Closes-Bug: #1250599

Change-Id: Ia75080553f97f4eb2b5f4f4c3fc3e550fd318655
Merge "Do not filter image list from glance api"
Merge "Empty files shouldn't contain copyright nor license"
Merge "Make download an action rather than a column"