Security update for mailman

This update for mailman fixes the following issues:

- CVE-2019-3693: Fixed a privilege escalation during package install. Could be
exploited by a local users who is members of the the mailman group. (boo#1154328)

This update was imported from the openSUSE:Leap:15.1:Update update project.

Fixed bugs
bnc#1154328
VUL-0: CVE-2019-3693: mailman: LPE from wwwrun to root; ability to chgrp arbitrary files to mailman
Selected Binaries
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