remove some dead code
see https://forum.netgate.com/topic/171394/sledgehammer-killall-in-shaper-php-and-inc-files
Unbound option to keep probing when servers are down. Implements #13023
Use correct rx/tx index. Fixes #8861
OpenVPN unbound restart fixes. Issue #12991
Make openvpn.connect_async.sh executable
Add option to limit concurrent connections per OpenVPN user. Implements #12267
Clear stale Cisco-AVPair anchor rules. Fixes #12332
Improve OpenVPN client connection logging and logicIn preperation for fixes and features
Use OpenVPN deferred client-connect. Implements #12407
Move openvpn client-connect script to separate fileto prepare for deferred client-connect
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