OPNSense/core 855c687src/opnsense/service/templates/OPNsense/Auth sudoers, src/www system_advanced_admin.php

system: allow an arbitrary group for sudo like ssh login; closes #3407

(cherry picked from commit 6e727e43d2fde40e9d23ed3554c0404eb4ef153a)
DeltaFile
+42-31src/www/system_advanced_admin.php
+6-0src/opnsense/service/templates/OPNsense/Auth/sudoers
+48-312 files

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