core/netmap: change node addresses iteration order

[fyrchik]

Previously we have given external addresses a priority in some circumstances.
Now we prioritize internal addresses.

Should fix a problem where data interface is used even though internal is available.

Signed-off-by: Evgenii Stratonikov e.stratonikov@yadro.com

[codecov]

Codecov Report

Merging #2156 (74a1230) into master (02ac542) will not change coverage.
The diff coverage is n/a.

❗ Current head 74a1230 differs from pull request most recent head 6bf835c. Consider uploading reports for the commit 6bf835c to get more accurate results

@@           Coverage Diff           @@
##           master    #2156   +/-   ##
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  Coverage   30.77%   30.77%           
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  Files         382      382           
  Lines       28065    28065           
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  Hits         8637     8637           
  Misses      18696    18696           
  Partials      732      732           

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