Add -c parameter to make /bin/sh process the command

extra/systemd/celery.service

@@ -8,12 +8,12 @@ User=celery
 Group=celery
 EnvironmentFile=-/etc/conf.d/celery
 WorkingDirectory=/opt/celery
-ExecStart=/bin/sh '${CELERY_BIN} multi start $CELERYD_NODES \
+ExecStart=/bin/sh -c '${CELERY_BIN} multi start $CELERYD_NODES \
 	-A $CELERY_APP --logfile=${CELERYD_LOG_FILE} \
 	--pidfile=${CELERYD_PID_FILE} $CELERYD_OPTS'
-ExecStop=/bin/sh '${CELERY_BIN} multi stopwait $CELERYD_NODES \
+ExecStop=/bin/sh -c '${CELERY_BIN} multi stopwait $CELERYD_NODES \
 	--pidfile=${CELERYD_PID_FILE}'
-ExecReload=/bin/sh '${CELERY_BIN} multi restart $CELERYD_NODES \
+ExecReload=/bin/sh -c '${CELERY_BIN} multi restart $CELERYD_NODES \
 	-A $CELERY_APP --pidfile=${CELERYD_PID_FILE} --logfile=${CELERYD_LOG_FILE} \
 	--loglevel="${CELERYD_LOG_LEVEL}" $CELERYD_OPTS'