It is no longer supported by jammy and lead us to the following errors with the announce-release job.
```
No package matching 'python-dev' is available
```
Change-Id: Ie84a6e9f641f2bd586fdf6e56eab6406a7fbf48b
The basepython line was causing the py35 tests to actually run under
python2. Whoops.
It was doing the same to pypy. Add pypy to bindep with the pypy tag.
Cryptography and the version of pypi in xenial are incompatible, so
update the pypy job to run on fedora-26 instead, which has a new enough
pypy.
Shift the line so that it only applies to functional and ansible tests,
since that's where it's used.
Depends-On: I7c22e23b73ddfc18ee28e87d34d1988417b49ccb
Change-Id: Ia27a0aa0633dcf48c1bab06b3c803f996eae9efa
Hervé Beraud