ceph-volume tests.simple replace testinfra command for py.test

Signed-off-by: Alfredo Deza <adeza@redhat.com>

src/ceph-volume/ceph_volume/tests/functional/simple/tox.ini

@@ -47,7 +47,7 @@ commands=
   ansible-playbook -vv -i {changedir}/hosts {envdir}/tmp/ceph-ansible/tests/functional/setup.yml
 
   # test cluster state testinfra
-  testinfra -n 4 --sudo -v --connection=ansible --ansible-inventory={changedir}/hosts {toxinidir}/../tests
+  py.test -n 4 --sudo -v --connection=ansible --ansible-inventory={changedir}/hosts {toxinidir}/../tests
 
   # make ceph-volume simple take over all the OSDs that got deployed, disabling ceph-disk
   ansible-playbook -vv -i {changedir}/hosts {changedir}/test.yml
@@ -59,6 +59,6 @@ commands=
   sleep 120
 
   # retest to ensure cluster came back up correctly after rebooting
-  testinfra -n 4 --sudo -v --connection=ansible --ansible-inventory={changedir}/hosts {toxinidir}/../tests
+  py.test -n 4 --sudo -v --connection=ansible --ansible-inventory={changedir}/hosts {toxinidir}/../tests
 
   vagrant destroy {env:VAGRANT_DESTROY_FLAGS:"--force"}