selftest: test samba-tool group commands with groupnames with brackets and spaces

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14296

Signed-off-by: Björn Baumbach <bb@sernet.de>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit 534809a0)
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