Add support for IPV6 in stream upstream servers

[aledbf]

replaces #2424

[k8s-ci-robot]

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[codecov-io]

Codecov Report

Merging #2649 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2649   +/-   ##
=======================================
  Coverage   40.79%   40.79%           
=======================================
  Files          74       74           
  Lines        5084     5084           
=======================================
  Hits         2074     2074           
  Misses       2727     2727           
  Partials      283      283

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