For python2/python3 compatibility install additional (python2-future)
and different (python2-ipaddress) packages during test.

Also switch Fedora tests to explicitly install versioned python packages
(python2-* instead of python-*).
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>