add support for Kubernetes 1.10.8

[mboersma]

What this PR does / why we need it:

See https://github.com/kubernetes/kubernetes/releases/tag/v1.10.8

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 1.10.8

[CecileRobertMichon]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov]

Codecov Report

Merging #3868 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3868      +/-   ##
==========================================
- Coverage   56.34%   56.32%   -0.02%     
==========================================
  Files         109      109              
  Lines       16458    16458              
==========================================
- Hits         9273     9270       -3     
- Misses       6376     6380       +4     
+ Partials      809      808       -1