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If a container is configured with the internal DNS resolver's own
address as an external server, try the next ext server rather than
recursing (return SERVFAIL if there are no other servers).
Signed-off-by: Rob Murray <rob.murray@docker.com>
(cherry picked from commit 87506142d8)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>