Updated openstack/openstack
Project: openstack/nova  126e1c5ae12ffca8ba460c4fe2888eda46c36461
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Enable flake8 H404 checking

This check indicates on comments in which multi line docstring should
start without a leading new line. This change fixed all violators of
said check.

Change-Id: Ic7357b8c7420767dba611f6fcee07b7700f3aea8