examples: add systemd socket and service files

Since we have init scripts, we ought to have the equivalent for
systemd users who cannot upgrade via the normal SIGUSR2 mechanism;
but can use multiple services: "unicorn@1" + h"unicorn@2" to
accomplish the same thing.

Based on examples by Christos Trochalakis <yatiohi@ideopolis.gr>

ref:
http://bogomips.org/unicorn-public/20150708130821.GA1361@luke.ws.skroutz.gr/

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