This release includes the following changes:
- Kubernetes v1.17.6 (#6183)
- Pin docker client version (#6163 and #6179)
- Bugfix kubernetes-dashboard template (#6066 and #6179)
- Create namespace when dashboard deployment uses customized namespace (#6107 and #6179)
- Bugfix apiserver port when upgrading a cluster with a custom apiserver port (#6136 and #6179)