Drop pypy default tox env
Drop pypy default tox env

Change-Id: I75ad6cb86221f424d4a65e84329b147ed2b0aada
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

openstack-infra/reviewstats,openstack-infra/reviewstats