Monkey-patch pykube to be compatible with 1.16

[aermakov-zalando]

ZMON still uses a very old Python version, so it's impossible to update pykube to a version that's compatible with 1.16. Let's just monkey-patch its objects instead.

[codecov[bot]]

Codecov Report

Merging #432 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #432      +/-   ##
==========================================
+ Coverage   75.31%   75.35%   +0.03%     
==========================================
  Files          81       81              
  Lines        6024     6029       +5     
==========================================
+ Hits         4537     4543       +6     
+ Misses       1487     1486       -1

Impacted Files	Coverage Δ
zmon_worker_monitor/builtins/plugins/kubernetes.py	100% <100%> (ø)	:arrow_up:
zmon_worker_monitor/process_controller.py	84.57% <0%> (-0.52%)	:arrow_down:
zmon_worker_monitor/zmon_worker/tasks/main.py	74.61% <0%> (+0.4%)	:arrow_up:

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[mikkeloscar]

:+1:

[aermakov-zalando]

👍

[pitr]

:+1: