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DNS lookup of an invalid host name fails with a different error in a proxy environment than it does in an environment without proxy. Many tools, including curl, use the `no_proxy` environment variable to provid a list of hosts for which proxy should not be used. To make lookup failure consistent, add invalid host names to the `no_proxy` environment variable in tests that attempt to look up invalid host names. This way the lookup will fail consistently regardless of whether proxy is generally used or not. Signed-off-by: william.r.dieter <william.r.dieter@intel.com>