refs #2310 Add post script

debian/opengnsys-opentracker.postinst

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+if [ "$1" = "configure" ]; then
+    systemctl daemon-reexec || true
+    systemctl preset opentracker.service >/dev/null 2>&1 || true
+    systemctl enable opentracker.service >/dev/null 2>&1 || true
+fi
+
+exit 0

debian/opengnsys-opentracker.postrm

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+
+if [ "$1" = "remove" ]; then
+    systemctl disable opentracker.service >/dev/null 2>&1 || true
+    systemctl daemon-reload || true
+fi
+
+exit 0