Add support for Kubernetes 1.12.3

[mboersma]

What this PR does / why we need it:

See https://github.com/kubernetes/kubernetes/releases/tag/v1.12.3

TODO:

• upload Windows binary

If applicable:

• documentation
• unit tests
• tested backward compatibility (ie. deploy with previous version, upgrade with this branch)

Release note:

Add support for Kubernetes 1.12.3

[codecov]

Codecov Report

Merging #57 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #57   +/-   ##
=======================================
  Coverage   52.42%   52.42%           
=======================================
  Files          91       91           
  Lines       12804    12804           
=======================================
  Hits         6713     6713           
  Misses       5483     5483           
  Partials      608      608

[CecileRobertMichon]

/lgtm

[sylr]

/lgtm

[acs-bot]

@sylr: changing LGTM is restricted to assignees, and only Azure/aks-engine repo collaborators may be assigned issues.

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In response to this:

/lgtm

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[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon, jackfrancis, mboersma, sylr

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