Add e2e test for configmap change and reload

[aledbf]

No description provided.

[ElvinEfendi]

/lgtm

[ElvinEfendi]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, ElvinEfendi

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[codecov-io]

Codecov Report

Merging #2674 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2674   +/-   ##
=======================================
  Coverage   40.93%   40.93%           
=======================================
  Files          72       72           
  Lines        5088     5088           
=======================================
  Hits         2083     2083           
  Misses       2721     2721           
  Partials      284      284

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