samba_backup bug fix, error message enhancements, command line enhancement

[Brian Martin]

I'm a first-time patch submitter, so please guide me if I haven't 
prepared this properly.

The attached patch updates source4/scripting/bin/backup_samba as follows:
     - Fix retention period bug when deleting old backups ($DAYS variable
       could be set, but was ignored).
     - Allow retention period ("DAYS") to be specified as a command line 
parameter.
     - Allow individual positional parameters to be left at the default
       by specifying "-".
     - Use IS0 8601 standard dates (yyyy-mm-dd instead of mmddyyyy).
     - Display tar exit codes when reporting errors.
     - Don't send error messages to /dev/null, so we know what failed.
     - Suppress useless tar "socket ignored" message.

Thank you for considering this patch.

                                    -Brian Martin


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