Have test.py run all checks if no arguments given
Have test.py run all checks if no arguments given

test.py and test.py --check-all are now equivalent.
Previously test.py did nothing if no arguments were given.

Change-Id: I405323d48f92972578a4942f4947f2f61ce6756d

gongysh2004/openstack-manual,kairoaraujo/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,gongysh2004/openstack-manual,openstack/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,potsmaster/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals