core: update cluster-proportional-autoscaler to v1.1.2

[harsha-y]

This updates the image version for cluster-proportional-autoscaler to v1.1.2
This version uses client-go 3.0 beta which is fully compatible with k8s 1.6

References

• https://github.com/kubernetes-incubator/cluster-proportional-autoscaler/blob/master/CHANGELOG.md
• https://github.com/kubernetes/client-go#compatibility-matrix

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[harsha-y]

@k8s-ci-robot cla signed

[codecov-io]

Codecov Report

Merging #701 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #701   +/-   ##
=======================================
  Coverage   35.31%   35.31%           
=======================================
  Files          53       53           
  Lines        3047     3047           
=======================================
  Hits         1076     1076           
  Misses       1802     1802           
  Partials      169      169

Impacted Files	Coverage Δ
core/controlplane/config/config.go	57.01% <100%> (ø)	⬆️

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[mumoshu]

@harsha-y Thanks for the contribution 👍
LGTM!

Btw, not necessarily addressed in this PR but I wonder if we'd better upgrade to 1.1.2-r2 soon?