Maintainance release
- host-gw backend: routes did not survive interface going down and up (e.g. cable unplug). Thank you, Huang.
- aws-vpc backend: now supports role based auth in addition to env vars. Thank you, Greg Poirier.
- fixed problem of flannel failing to work with interfaces that have peer addresses defined.
- turn on etcd client logging. This will produce a lot of output but better than no output as it now.