Commits on Sep 10, 2020

1. gcp, azure: Handle azure vips similar to GCP …

   This PR does the following things:
   
   - Rename gcp-routes-controller to apiserver-watcher, since it is generic
   - Remove obsolete service-management mode from gcp-routes-controller
   - Change downfile directory to /run/cloud-routes from /run/gcp-routes
   - Write $VIP.up as well as $VIP.down
   - Add an azure routes script that fixes hairpin.
   
   Background: Azure hosts cannot hairpin back to themselves over a load
   balancer. Thus, we need to redirect traffic to the apiserver vip to
   ourselves via iptables. However, we should only do this when our local
   apiserver is running.
   
   The apiserver-watcher drops a $VIP.up and $VIP.down file, accordingly,
   depending on the state of the apiserver. Then, we add or remove iptables
   rules that short-circuit the load balancer.
   
   Unlike GCP, we don't need to do this for external traffic, only local
   clients.

   

   squeed authored and cgwalters committed Sep 10, 2020
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