datapath-windows: Add WMI to set Hyper-V port "friendly name" from NOVA.

Added a function Set-VMNetworkAdapterOVSPortDirect() to be called from
NOVA driver to set a name on the port of the first VNIC for the specified VM.

Usage example:
Set-VMNetworkAdapterOVSPortDirect -OVSPortName ovs-port-5 -VMName NoOS

To confirm that the name was set:
Get-VMNetworkAdapterByOVSPort  -OVSPortName ovs-port-5

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>