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Get node ipv4 from dns as fallback

Spyridon Trigazis requested to merge nslookup into cern/train

When the metadata service is not available in Ironic nodes, we use hostname -I to get the IP address of the node.

  1. In train-stable-7 hostname does not exist
  2. Some special nodes from IC-CS return multiple addresses

To workaround 1 and 2 we can get the IP from DNS.

closes: #51 (closed) closes: #55 (closed)

Signed-off-by: Spyros Trigazis spyridon.trigazis@cern.ch

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