Make deploy_ovf.py work for vCenter as well
Make deploy_ovf.py work for vCenter as well

Fix for #281. Now the _host_ can be vCenter as well as an ESXi host.
vmware/pyvmomi-community-samples,ddcrjlalumiere/pyvmomi-community-samples,pathcl/pyvmomi-community-samples,jm66/pyvmomi-community-samples,prziborowski/pyvmomi-community-samples