fix N402 for nova/scheduler

fixes N402 (single line docstrings should end in period) for
nova/scheduler files.

Change-Id: I8e7b6a93df53fcd5c9491f533cadd093f4b802e0
fix N402 for nova/network

fixes N402 (single line docstring should end in a period) for
nova/network.

Change-Id: I2a24a2fef78cbafd3113b86515ac8fd92cc47e80
Merge "fix N402 for nova/scheduler"
Merge "fix N402 for nova/network"