chore: Update Azure CNI to 1.4.0

[AbelHu]

Reason for Change:

chore: Update Azure CNI to 1.4.0

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e6c160c). Click here to learn what that means.
The diff coverage is 38.28%.

@@            Coverage Diff            @@
##             master    #4500   +/-   ##
=========================================
  Coverage          ?   72.05%           
=========================================
  Files             ?      141           
  Lines             ?    21765           
  Branches          ?        0           
=========================================
  Hits              ?    15682           
  Misses            ?     5131           
  Partials          ?      952           

Impacted Files	Coverage Δ
cmd/rotatecerts/arm.go	0.00% <0.00%> (ø)
cmd/rotate_certs.go	11.03% <11.03%> (ø)
cmd/scale.go	12.56% <12.37%> (ø)
cmd/addpool.go	17.97% <17.97%> (ø)
cmd/update.go	23.07% <23.07%> (ø)
cmd/upgrade.go	35.92% <25.00%> (ø)
cmd/get_logs.go	49.57% <49.57%> (ø)
cmd/get_skus.go	50.63% <50.63%> (ø)
cmd/root.go	56.28% <52.63%> (ø)
cmd/generate.go	50.41% <54.54%> (ø)
... and 7 more

---

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[AbelHu]

@jsturtevant It seems like that the test cases are flaky
https://dev.azure.com/aks-engine/AKS-Engine/_build/results?buildId=6890&view=results
https://dev.azure.com/aks-engine/AKS-Engine/_build/results?buildId=6889&view=results

[jsturtevant]

I think the 1.22 job is know flaky @jackfrancis? I've restarted it.

[jsturtevant]

/lgtm

[jackfrancis]

@jsturtevant Not the version that we have support for, let's wait to see what the re-run yields.

[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AbelHu, jackfrancis, jsturtevant

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