Specifying '-f' will add the 'force' option to the DROP DATABASE command
sent to the server.  This will try to terminate all existing connections
to the target database before dropping it.

Author: Pavel Stehule
Reviewed-by: Vignesh C and Amit Kapila
Discussion: https://postgr.es/m/CAP_rwwmLJJbn70vLOZFpxGw3XD7nLB_7+NKz46H5EOO2k5H7OQ@mail.gmail.com