Use glance as a backend for Solum LanguagePack API (POST Method)

First step is to create an image in glance. Next step will be to
upload the image data. That's how it is done in glance.

The created image will be marked as "queued" until the data is
sent.

Fixes bug 1301441

Change-Id: I5871367b6869e3bd048061635ec562d080345eb8
Merge "Use glance as a backend for Solum LanguagePack API (POST Method)"