[datafeed] attempt to acquire synchronization lock even when force is given instead of the implementation in e717da3dc164, raise an error if the lock is already grabbed and catch this error in the caller. See discussion on https://www.cubicweb.org/revision/10790765 Closes #10451635

#!/usr/bin/env python
from cubicweb.cwctl import run
import sys
run(sys.argv[1:])