DisableHostNetworkConnection requires UAC elevation

[IgorMilavec]

If your system has UAC enabled and you run VS normal/unelevated, the DisableHostNetworkConnection calls fail with:

System.ApplicationException: Failed to disable 'Ethernet 2' network connection. Return value is 5.
Make sure you're running the tests with elevated priviliges.

Could we mark tests as inconclusive instead of failing them in this case?
DisableHostNetworkConnection could use new Win32Exception(retValue), this would provide better error information.

[drieseng]

@IgorMilavec I have several fixes to stabilize the integration tests. I'll submit a PR when the open PR is merged.

That said ... I have no solution for some "(loss of) network connectivity" related tests like this one.
Let me know if you have any ideas.
For now, I'll ignore these tests in my next PR.

[IgorMilavec]

I access my dev machine over RDP and these tests would cut me off.
What about pausing the docker container? Again we make a lot of assumptions here, but if the container is running on the same host as tests, this might work.

[drieseng]

We'd have to test it. Can you have a look at this?

[IgorMilavec]

I have done some preliminary tests and pausing the docker container works. I'll prepare it and make a PR after you submit your pending changes, otherwise we'll have a lot of merge conflicts.