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And remove the unused StringSet type.

Export the node Status as metrics.

Also add instrumentation for the load balancer module.

We only use the proxy for Icecast streaming so there's no need to be
generic.

Includes a merge of radiod and redirectord, updates to more modern Go
idioms, adoption of the higher level etcd concurrency primitives, and
a lot of other minor implementation changes.

The refactor is still incomplete: the daemons won't compile and the
code to start the RPC servers is missing.

Add an option to load a file containing redirects (source, target paths)
and serve them from the HTTP server, to allow renaming a radio without
breaking old links.

This change involves a refactoring of the DNS redirector code, which is
now a bit cleaner and has proper tests.

- Changed package name to autoradio-server to avoid conflicts;
- fixed systemd service files and defaults;
- added sudo configuration to restart icecast2;
- removed obsolete prerm/postrm scripts.

It should work with Debian wheezy (sysvinit) and jessie (systemd)
without having to pass a reload command as a command-line flag.