add multiple sdn providers to playbooks

[v1k0d3n]

i think we need to add multiple cni-enabled sdn providers to the set of playbooks. i would like to see this done in the following (somewhat opinionated) way:

role:
  kube-sdn:
    tasks:
      main.yml (referring to other sdn playbooks)
        calico.yml
        canal.yml
        romana.yml
        weave.yml

i would like to add an "sdn boostrapped" artifact in /etc/kubernetes/halcyon/network/.sdn, and include the following output that can then be used later to identify which SDN is deployed:

ubuntu@kube1:~$ cat /etc/kubernetes/halcyon/network/.sdn

# Halcyon Network Deployment:
kube_sdn_deploy: {{ kube_sdn_deploy }}
kube_sdn: {{ kube_sdn }}

if any of the sdn folks are interested in this, that's fine...i can pick this up later as well.

[v1k0d3n]

along with this, i want to keep an eye on items like: https://github.com/kubernetes/kubernetes/issues/34101 http://stackoverflow.com/questions/39872332/how-to-fix-weave-net-crashloopbackoff-for-the-second-node

we may need to fetch the manifests, and adjust them based on the deployment. the instructions included with romana at least address this issue. the community is still trying to determine how to handle this going forward.

[v1k0d3n]

@aric49 do you want to take a stab at doing this? i can explain more, and help next week.

[v1k0d3n]

done. closing issue.