* chore: remove support for Kubernetes 1.11.x
* chore: remove k8s 1.11 from VHD
* chore: remove k8s 1.12 from VHD
* chore: remove support for Kubernetes 1.12.x
* test: rollback to 1.13.11 in tests
* chore: cleanup addons and legacy cruft
* test: remove 1.12 from test configs
* fix: Update k8s version references in docs/samples
* change orchestrator version to 1.12
* change version to 1.10
* Apply suggestions from code review
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Co-Authored-By: Cecile Robert-Michon <cerobert@microsoft.com>