bugfix: fix ipv6 addr calculate error

[hhyasdf]

Pull Request Description

Describe what this PR does / why we need it

Fix ipv6 address calculating problems, two functions will fail if use ipv6 subnet.

Does this pull request fix one issue?

NONE.

Describe how you did it

Describe how to verify it

Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #118 (28bcbce) into main (79905a7) will decrease coverage by 0.38%.
The diff coverage is 58.33%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   19.76%   19.38%   -0.39%     
==========================================
  Files          31       31              
  Lines        2519     2512       -7     
==========================================
- Hits          498      487      -11     
- Misses       1964     1968       +4     
  Partials       57       57              

Flag	Coverage Δ
unittests	19.38% <58.33%> (-0.39%)	⬇️

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

Impacted Files	Coverage Δ
pkg/controller/ipam/pod.go	0.00% <0.00%> (ø)
pkg/daemon/utils/ip_range.go	78.94% <100.00%> (-1.43%)	⬇️

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[mars1024]

/lgtm