systemd: initial i2pd.service & .d/override.conf

Begins #38

etc/systemd/system/i2pd.service

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+[Unit]
+Description=I2P Router written in C++
+Documentation=man:i2pd(1) https://i2pd.readthedocs.io/en/latest/
+After=network.target
+
+[Service]
+User=i2pd
+Group=i2pd
+RuntimeDirectory=i2pd
+RuntimeDirectoryMode=0700
+LogsDirectory=i2pd
+LogsDirectoryMode=0700
+Type=forking
+# Mikaela: my only modification, removing routerinfo and sleeping
+# to workaround https://github.com/PurpleI2P/i2pd/issues/1275
+ExecStartPre=/bin/rm -f /var/lib/i2pd/routerinfo
+ExecStartPre=/bin/sleep 15
+# Mikaela: normal commands
+ExecStart=/usr/sbin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/var/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
+ExecReload=/bin/kill -HUP $MAINPID
+PIDFile=/var/run/i2pd/i2pd.pid
+### Uncomment, if auto restart needed
+#Restart=on-failure
+
+KillSignal=SIGQUIT
+# If you have the patience waiting 10 min on restarting/stopping it, uncomment this.
+# i2pd stops accepting new tunnels and waits ~10 min while old ones do not die.
+#KillSignal=SIGINT
+#TimeoutStopSec=10m
+
+# If you have problems with hanging i2pd, you can try increase this
+LimitNOFILE=4096
+# To enable write of coredump uncomment this
+#LimitCORE=infinity
+PrivateDevices=yes
+
+[Install]
+WantedBy=multi-user.target

etc/systemd/system/i2pd.service.d/override.conf

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+[Service]
+ExecStartPre=/bin/rm -f /var/lib/i2pd/routerinfo
+ExecStartPre=/bin/sleep 15