Add support for Python 3

[Barry Warsaw]

lazr.restfulclient is on the critical path for supporting Python 3 in launchpadlib. launchpadlib must support Python 3 in Quantal in order to be included on the CD images, and a lot of other desktop apps depend on launchpadlib, so this whole dependency stack must be ported.

I'm willing to work on it, but it's best to have an issue opened on it,hence this bug report.

See the following blueprint for details:

https://blueprints.launchpad.net/ubuntu/+spec/foundations-q-python-versions

[Barry Warsaw (barry)]

I'm working my way up the stack. I should have a MP for lazr.authentication soon. LP: #1007437

[Barry Warsaw (barry)]

I'm unassigning myself and turning this back into a wishlist. I spent some time working on this, but the dependency stack is too deep and several of the dependencies (e.g. lazr.authentication and wadllib) don't actually share the same model of bytes/str afaict. Meaning, this is not an easy stack to port. It doesn't help that much of the test dependencies themselves are unported. For now, we're just going to remove this as a package from task:ubuntu-desktop.

[Dimitri John Ledkov (xnox)]

Fix released in 0.13.4