fix: use force unmount to fix pod stuck terminating issue

flexvolume/blobfuse/deployment/blobfuse-flexvol-installer/blobfuse

@@ -131,16 +131,16 @@ unmount() {
 		exit 0
 	fi
 
-	echo "`date` EXEC: umount $MNTPATH, devname: $devname" >>$LOG
-	/bin/umount $MNTPATH >> $LOG 2>&1
+	echo "`date` EXEC: umount -f $MNTPATH, devname: $devname" >>$LOG
+	/bin/umount -f $MNTPATH >> $LOG 2>&1
 	if [ "$?" != "0" ]; then
 		errorLog=`tail -n 1 "${LOG}"`
 		err "{ \"status\": \"Failed\", \"message\": \"Failed to unmount volume at ${MNTPATH}, error log:${errorLog}\" }"
 		exit 1
 	fi
 
-	echo "`date` EXEC: rm -r ${MNTPATH}" >> $LOG
-	rm -r "${MNTPATH}" >> $LOG 2>&1
+	echo "`date` EXEC: rmdir ${MNTPATH}" >> $LOG
+	rmdir "${MNTPATH}" >> $LOG 2>&1
 
 	log '{"status": "Success"}'
 	exit 0