Update apparmor rules to take tests into accounts

mock-service/usr.bin.traprain-mock-service.in

@@ -58,4 +58,7 @@
   dbus (send, receive) bus=system peer=(label=@installed_testdir@/test-mock-service),
   dbus (send, receive) bus=system peer=(label=@bindir@/traprain-guidance-ui),
   dbus (send, receive) bus=system peer=(label=@bindir@/traprain-update-progress),
+
+  # Allow tests to ping us
+  dbus (send, receive) bus=system interface=org.freedesktop.DBus.Peer member=Ping peer=(label=*),
 }