Add a second test for testing that all networks are gone
Add a second test for testing that all networks are gone

Failure of the "--format proto" test does not tell which network was not
deleted.

Reviewed-By: Scott DAquila <8944595b0f0af46f2d3de382b750727aac9e5fa7@ms.com>

quattor/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,quattor/aquilon,quattor/aquilon,guillaume-philippon/aquilon