Revert "Remove the "flexisip" systemd script because it has no meaning. There is flexisip-proxy, flexisip-conference, and flexisip-presence."
Revert "Remove the "flexisip" systemd script because it has no meaning. There is flexisip-proxy, flexisip-conference, and flexisip-presence."

This reverts commit 1138d4a4ba5c30109c12b2bbc542d72eecc975e3.

We still need this script for our fs-test.linphone.org test server.

BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip