Enforce unicode usage within glance

[Flavio Percoco]

Glance currently does not enforce unicode usage within itself, instead, it has a mixed usage of encoded and decoded strings all around. An example of this, is the fact that exceptions expect a str whereas other areas are working w/ unicode. This has forced us to create some workarounds in some cases where more simple str handling would have been possible if there was a standard.

This whole behavior should be unified and standardized. It's a good practice to always decode everything and encode it at the very last moment before going "out there".

NOTE: To the implementer, pls, make use of safe_encode and safe_decode (openstack/common/strutils.py) when decoding / encoding.

[Kuo-tung Kao (jelly) (coding1314)]

If I want to fix the bug, do I need to find out all the string used by glance ?

[Victoria Martinez de la Cruz (vkmc)]

Is this bug still valid?

[Cyril Roelandt (cyril-roelandt)]

I think this is an issue that solved itself when we moved to Python 3, and no fix is needed.