Adapted to el7 slaves

No Junit needed
Some packages change names (maven3, junit4)
No selinug policy needed (so far at least)
Java version string changed
No python-argparse needed

Change-Id: I553a7f6e7b147a561c719e308741c351a6b7309a
Signed-off-by: David Caro <dcaroest@redhat.com>