implement router task for OpenStack platform

[zengchen1024]

This is part of work of issue (#3566)

[justinsb]

/ok-to-test

/lgtm

Exciting stuff :-)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, zengchen1024

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[justinsb]

Let me know when I can start testing OpenStack - I can't wait :-) Thank you for all your work on this @zengchen1024

[zengchen1024]

@justinsb Thank you very much for your reviewing! Regarding to the deployment of k8s on OpenStack, I think there are still many works to do. In my opinion, there are two big steps. First, it should build a virtual machine cluster which I am working on. Second, it should deploy k8s on this cluster, which is not started. About first step, there are several works to be done, including building network of cluster, creating auto scaling of virtual machines. I think I will complete the first step in April. I hope there are other contributors to join.