Adding UT for createHostNCApipaNetwork() function and cover the case for hostNCLoopbackAdapterName existence

[behzad-mir]

Need to write a follow up PR for: #3693

1. Add a UT to cover the path for existence of hostNCLoopbackAdapterName and vEthernethostNCLoopbackAdapterName
   2- correct the typos in the comment at

   azure-container-networking/cns/hnsclient/hnsclient_windows.go

   Line 307 in eb0cd87

   // We need to fitst check the existence of either "LoopbackAdapterHostNCConnectivity" or the vEthernet(LoopbackAdapterHostNCConnectivity) interfaces

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This issue is stale because it has been open for 2 weeks with no activity. Remove stale label or comment to keep it open.