Release 2019-04-04 - Hotfix (CVE mitigation)

• Bug fixes
  • New kubernetes versions released with multiple CVE mitigations
    • Kubernetes 1.12.7
      • https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md#changelog-since-v1126
    • Kubernetes 1.11.9
      • https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.11.md#changelog-since-v1118
    • Customers should upgrade to the latest 1.11 and 1.12 releases.
    • Kubernetes versions prior to 1.11 must upgrade to 1.11/1.12 for the fix.
• Component updates
  • Updated included AKS-Engine version to 0.33.2