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>

secop/lib/__init__.py

@@ -40,7 +40,7 @@ repodir = path.abspath(path.join(path.dirname(__file__), u'..', u'..'))
 CONFIG = {
     u'piddir': os.path.join(repodir, u'pid'),
     u'logdir': os.path.join(repodir, u'log'),
-    u'confdir': os.path.join(repodir, u'etc'),
+    u'confdir': os.path.join(repodir, u'cfg'),
     u'basedir': repodir,
 } if os.path.exists(os.path.join(repodir, u'.git')) else {
     u'piddir': u'/var/run/secop',