feat: add support for Kubernetes 1.14.0

[mboersma]

Reason for Change:

See https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.14.md

Issue Fixed:

Requirements:

• Windows artifacts uploaded to acsmirror blob store
• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[CecileRobertMichon]

lgtm

[mboersma]

I'll rebase this after #873 merges and then run tests.

[mboersma]

/azp run pr-e2e

I lied, I want to see the test results and I am not patient.

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

No pipelines are associated with this pull request.

[mboersma]

The 1.14 known issues mentions this:

There is a known issue coredns/coredns#2629 in CoreDNS 1.3.1, wherein if the Kubernetes API shuts down while CoreDNS is connected, CoreDNS will crash. The issue is fixed in CoreDNS 1.4.0 in coredns/coredns#2529.

But the Docker image k8s.gcr.io/coredns:1.4.0 is not available, only k8s.gcr.io/coredns.1.3.1 as is mentioned elsewhere throughout the release notes. So we'll use that.

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #876 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #876   +/-   ##
=======================================
  Coverage   68.29%   68.29%           
=======================================
  Files         115      115           
  Lines       16938    16938           
=======================================
  Hits        11567    11567           
  Misses       4613     4613           
  Partials      758      758

[mboersma]

There was one failure on the first run. I'm rebasing from master now.

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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