Add fedora dist files. (#413)

dist/fedora/nebula.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Nebula overlay networking tool
+
+After=basic.target network.target network-online.target
+Before=sshd.service
+Wants=basic.target network-online.target
+
+[Service]
+ExecReload=/bin/kill -HUP $MAINPID
+ExecStart=/usr/bin/nebula -config /etc/nebula/config.yml
+Restart=always
+SyslogIdentifier=nebula
+
+[Install]
+WantedBy=multi-user.target