Recommended changes for modifying bpend_notify_busy on UNIX

The administrator can modify busy file processing by changing the bpend_notify_busy script.

The only recommended changes are as follows:

Changing the RETRY_POLICY and RETRY_SCHED variables from NONE to the busy file backup policy name and schedule name.
Remove the files in the logs directory after busy file processing (these logs are not removed automatically):
- At the end of the busy_files() function, add the following command:
```
/bin/rm -f $LOG_FILE
```
- After the call to the busy_files() function in main, add the following commands:
```
/bin/rm -f $BUSYFILELOG
/bin/rm -f $RETRY_FILE
```