message: [Scripts and tools] Add ExecStop= to example systemd service
  With no stop command defined `systemctl stop pivxd` will send SIGTERM
  which can cause database corruption. With this change `pivx-cli stop`
  will be used to stop the daemon process gracefully.
diff: @@ -8,9 +8,13 @@ Group=pivx
  Type=forking
  PIDFile=/var/lib/pivxd/pivxd.pid
  +
  ExecStart=/usr/bin/pivxd -daemon -pid=/var/lib/pivxd/pivxd.pid \
  -conf=/etc/pivx/pivx.conf -datadir=/var/lib/pivxd
  +ExecStop=-/usr/bin/pivx-cli -conf=/etc/pivx/pivx.conf \
  + -datadir=/var/lib/pivxd stop
  +
  Restart=always
  PrivateTmp=true
  TimeoutStopSec=60s
  