Provide systemd files

+ move example cfg from etc/ to cfg/

Change-Id: I437b3e2aaca55539ff110f5a46e411b34e0a0b9c
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21319
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

cfg/test.cfg

@@ -0,0 +1,46 @@
+[node test config]
+description=description of the testing sec-node
+	.
+	Here should be the long description.
+	It can be very long.
+        .
+        a single . on a line gets stripped so you can make paragraphs.
+	.
+	These texts are supposed to be possibly very long.
+
+[interface tcp]
+type=tcp
+bindto=0.0.0.0
+bindport=10768
+
+
+[module LN2]
+class=secop_demo.test.LN2
+.description="random value between 0..100%%"
+value.unit = "%%"
+
+[module heater]
+class=secop_demo.test.Heater
+maxheaterpower=10
+.description="some heater"
+
+[module T1]
+class=secop_demo.test.Temp
+sensor="X34598T7"
+.description="some temperature"
+
+[module T2]
+class=secop_demo.modules.CoilTemp
+sensor="X34598T8"
+.description="some temperature"
+
+[module T3]
+class=secop_demo.modules.CoilTemp
+sensor="X34598T9"
+.description="some temperature"
+
+
+[module Lower]
+class=secop_demo.test.Lower
+.description="something else"
+