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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>
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