Remove the Hyper-V driver

Nova Hyper-V driver is not tested in OpenStack upstream and no maintianers.
This driver has been marked as deprecated in Antelope release. It has dependency
on the OpenStack Winstacker project which has been retired[1].

As discussed in vPTG[2], removing the HyperV driver, tests, and its config.

[1] https://review.opendev.org/c/openstack/governance/+/886880
[2] https://etherpad.opendev.org/p/nova-caracal-ptg#L301

Change-Id: I568c79bae9b9736a20c367096d748c730ed59f0e

setup.cfg

@@ -31,8 +31,6 @@ osprofiler =
     osprofiler>=1.4.0 # Apache-2.0
 zvm =
     zVMCloudConnector>=1.3.0;sys_platform!='win32'  # Apache 2.0 License
-hyperv =
-    os-win>=5.5.0 # Apache-2.0
 vmware =
     oslo.vmware>=3.6.0 # Apache-2.0