CLOUDSTACK-5610: Host doesn't go to Down/Alert state even though it is powered off. VM
deployment fails because of that as cloudstack tries to deploy it on a host which is
ctually down. An investigator wasn't present for hyper-v; so cloudstack wasn't able to
determine the status of the host. Wrote an investigator for hyper-v which checks with
other hosts in the cluster for the status of the host being investigated.
Fix check style errors