Recommended update for mailman

This update for mailman fixes the following issues:

- Add /etc/mailman/mailman.cgi-gid and fix user rights (boo#1095112)

This update was imported from the openSUSE:Leap:15.0:Update update project.

Fixed bugs
bnc#1095112
GNU Mailman upgrade from 42.3 to 15.0 breaks mailman's web interface, needed file /etc/mailman/mailman.cgi-gid not in mailman 2.1.26 pkg for 15.0 anymore
Selected Binaries
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