Code review comment for lp:~frankban/juju-quickstart/add-tox

*** Submitted:

Introduce tox for testing multiple sets of deps.

Quickstart must be run on several platforms/Ubuntu series,
each one with its own versions of the packages that
Quickstart depends on. The tox utility is used for both:
- handling those kind of separate scenarios;
- creating the development virtual environments.
The latter was previously done using virtualenv directly
in the Makefile. The new infrastructure should be
more flexible.

Update the relevant parts of the Makefile, also handling
the automatic installation of system dependencies.

Implement the ability to calculate the requirements
for the PyPI package automatically by parsing the
tox.ini file. I am not really sure about the method I
used (take a look at the setup.py file), but the
alternative is to manually update those and violate DRY.
I think we could give it a try and fall back to the
manual approach if required.

Also implement a correct behavior for
"python setup.py test", which now runs all the tests.

To test and QA this branch, run `make clean` and then
follow what described in the HACKING.rst file, in the
following paragraphs:
- Creating a development environment
- Testing and debugging the application
- Requirements
- Updating application and test dependencies

Thank you!

R=bac, benjamin.saller, jeff.pihach
CC=
https://codereview.appspot.com/189580044

https://codereview.appspot.com/189580044/