[engine-1.21] Add functions to separate ipv4 from ipv6 functions

[manuelbuil]

Signed-off-by: Manuel Buil mbuil@suse.com

Proposed Changes

This PR adds two functions to discriminate ipv4 and ipv6 addresses. This will simplify our lives if we want to use dual-stack with cni plugins such as Calico which does not follow the kubernetes convention "cluster-cidr: $CIDR_ipv4,$CIDR_ipv6"

Types of Changes

New feature. Two new functions in a library

Verification

Linked Issues

• Support dual-stack in cni: calico rancher/rke2#1717
• [engine-1.21] Add functions to separate ipv4 and ipv6 CIDRs #3928

User-Facing Change

NONE

Further Comments

[codecov-commenter]

Codecov Report

Merging #3929 (75d3e27) into engine-1.21 (ed5991f) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           engine-1.21    #3929      +/-   ##
===============================================
- Coverage        11.58%   11.57%   -0.02%     
===============================================
  Files              136      136              
  Lines             8847     8855       +8     
===============================================
  Hits              1025     1025              
- Misses            7598     7606       +8     
  Partials           224      224              

Flag	Coverage Δ
inttests	0.68% <0.00%> (-0.01%)	⬇️
unittests	11.22% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/net.go	0.00% <0.00%> (ø)

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