Fixed H405 pep8 style check
Fixed H405 pep8 style check

* H405  multi line docstring summary not separated with an empty line

Change-Id: I0e5239e7b2856f2104130accce1555e59dfa487d

openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,esikachev/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests