add bareos user to floppy group in bareos-sd

[wucke13]

Hi, I would like to use my autochanger with this excellent dockerized bareos setup. However, the the device file for both the autochanger and the tape drive are owned by root:floppy (in the ubuntu image). However, the bareos user in said container is only part of the following groups:

• bareos
• disk
• tape

Hence accessing the tape or the changer does not work. So either the bareos user would have to be added to floppy group, or the udev rules would have to be changed to chown tape drives and autochangers to the tape group.

[barcus]

#81