Add new test for the volume upload in Glance functionality

The new test belongs to the _actions endpoints. A new method
"upload_volume" is added in the base volume class to support the
functionality.

Change-Id: I7f9f0e6983199012522d5a398dd7759d9adb7d71
Fixes: bug #1193379
Merge "Add new test for the volume upload in Glance functionality"