test: check k8s events to see if node-problem-detector works

[mboersma]

Reason for Change:
Adds an e2e test spec that creates a kernel message which node-problem-detector should turn into a Kubernetes event, if everything is wired up properly.

Issue Fixed:
Follows up on #2371
Refs #2389, #2411

Requirements:

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

Notes:

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #2444 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2444   +/-   ##
=======================================
  Coverage   72.29%   72.29%           
=======================================
  Files         130      130           
  Lines       23606    23606           
=======================================
  Hits        17066    17066           
  Misses       5516     5516           
  Partials     1024     1024

[mboersma]

I've tested this thoroughly with an apimodel that enables the node-problem-detector addon.

[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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