FTBFS on python3.5 in xenial

[Dimitri John Ledkov]

I was not sure which branches you use for release.

checkbox package in xenial started to fail to build from source and has started to cause migration blockages.

I have fixed it.

In essence it looks like python3.5 compatibilites things:

* OrderedDict was mutated, whilst iterating. I made sure the values iterated over are copied into a new list, thus allowing to modify the OrderedDIct under interation.
* python setuptools test target in setup.py started to be weird and got confused about checkbox.dbus vs system-wide dbus modules, i fixed that in packaging by simply using unittest runner directly
* qt3d5-dev does not appear to be used, and it is in progress demoted to universe, this dependency was dropped from the package.

The patch of these changes is here:

http://launchpadlibrarian.net/229128750/checkbox_0.18-0ubuntu3_0.18-0ubuntu4.diff.gz

[Sylvain Pineau (sylvain-pineau)]

We've dropped checkbox-old in xenial and failing tests/modules are no longer an issue. Checkbox in xenial is now checkbox-converged and only this package.