[release-1.13] make ServiceCIDR independent in ManagedPools

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4503

/assign nawazkh

Service CIDR addition to AKS Cluster should be independent of DNS Service IP

[nawazkh]

/cc @kubernetes-sigs/cluster-api-provider-azure-pms

[mboersma]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: eb87ed54f24cf1aa0aae5ed47303f787df5973a3

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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[nawazkh]

PR is asking for my review, hence
/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (92d4590) 62.10% compared to head (daffc8b) 62.10%.
Report is 1 commits behind head on release-1.13.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.13    #4549   +/-   ##
=============================================
  Coverage         62.10%   62.10%           
=============================================
  Files               189      189           
  Lines             18626    18626           
=============================================
  Hits              11568    11568           
  Misses             6421     6421           
  Partials            637      637           

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