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Add a new allowed value for the configuration parameter client.dns.lookup introduced by KIP-235

client.dns.lookup = "use._all._dns._ips"

The other values for this parameter, including the default, maintain the existing behavior of only attempting to connect to the first resolved IP, so there will be no backwards compatibility issue.
Setting the parameter to "use._all._dns._ips" will have the client try to connect to all resolved IPs and will not try the canonical hostname resolution enabled by KIP-235 

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If the configuration parameter client.dns.lookup is set to "use._all._dns._ips"  the network client code will use

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