Sync log from oslo-incubator

Change-Id: I292789214d74d00c33d5111625b452bb1b339c4f
Fix N402 for nova/virt

Fix N402 errors (single line docstring should end in a period)
for nova/virt, part of a larger attempt to stop ignoring our own
hacking.py tests.

Change-Id: I523ce41bd2b38c73cf3fdb031101ccc0695f2488
Merge "Sync log from oslo-incubator"
Merge "Fix N402 for nova/virt"