only output debug messages for samba config issues
rational:
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a lot people have no samba at all configured but the executables installed => each start of close to any kio based application prints some lines of issues
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you have configuration that has issues that testparm doesn't like on your company systems => same, and users can't do a thing
for debugging the functionality this seems useful
With this, for the first time since years, I can start e.g. KWrite or Dolphin in the terminal without warnings both on a plain Manjaro install and on a workstation at company (with awful but necessary smb.conf settings testparm really doesn't like, as deprecated/...)