Convert network provider tests to vcsim test context

We'll eventually need the vcsim test context to be aware of networking
in order to create VMs with the correct NICs in the ConfigSpec. Do the
conversion now in preparation of fixing an immediate bug in the
provider.

Author: bryanv

pkg/vmprovider/providers/vsphere/network/network_provider.go

@@ -122,7 +122,7 @@ func (l InterfaceInfoList) GetNetplan(
 
 			// NetOp (VDS) never assigns MacAddress to the NetworkInterface status, therefore
 			// netplanEthernet.Match.MacAddress will be empty.
-			// At this point, it is assumed that VirtuaLMachine.Config.Hardware.Device has MacAddress generated.
+			// At this point, it is assumed that VirtualMachine.Config.Hardware.Device has MacAddress generated.
 			netplanEthernet.Match.MacAddress = NormalizeNetplanMac(curNic.GetVirtualEthernetCard().MacAddress)
 		}