Revert "Removing mypy to fix the nova CI"
Revert "Removing mypy to fix the nova CI"

This reverts commit 531fa4cd04ca1b8ee869f95d427ea26df0852541.

Change-Id: Ia095a9ace86694fd431f2a1c8f59516ed1eb0d7e

openstack/nova,openstack/nova,mahak/nova,mahak/nova,mahak/nova,openstack/nova