daviddrysdale / c-ares

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Fixing slow DNS lookup issue

This patch is fixing the dns lookup issue due to dummy dns information
of a disconnected adapter(in my case is a bluetooth adapter). I changed
the dns lookup policy to try GetNetworkParams first because the
GetNetworkParams provides the most reliable dns information (lots of
checks were done by system). I also filter out inoperable adapter in
DNS_AdaptersAddresses in case GetNetworkParams fail.