Currently when creating a new file/directory in /etc/bareos, it will have its group set to the primary-group of the user that created the file (in case of user "root", that is usually "root").
As a result Bareos might be unable to read the new file.
This is especially true if you cp somefile.conf newfile.conf as the default files have all bits for other cleared (i.e. 0640), but would also impose a problem when you have an umask that denies read-access to other (i.e. 0026).

If /etc/bareos and its children had the setgid bit set, creating new files/directories would inherit the group from the directory and all new files would have their group set to "bareos" automatically.

This PR aims to setgid for configdir

• cmake install permissions
• [X rpm %attr
• deb control
• freebsd-bareos
  - drwxr-sr-x 5 bareos wheel 512B May 20 08:05 /usr/local/etc/bareos do we want 0750 -> we keep it like this (for traymonitor)
  - [X] fix /usr/local/etc/bareos/bconsole.conf from 0644 -> 0640
• windows
• Changelog as Breaking changes
• no backport decided on May 20th

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