- use upstream service and scripts
- switch to integrated-vtysh-config, abandon per-daemon config
- use always daemon names in options (e.g. ospf -> ospfd)
- zebra, mgmtd and staticd are always enabled
- abandon vtyListenAddress, vtyListenPort options; use
just "extraOptions" or "options" instead, respectively
- extend test to test staticd
- update release-notes
- pkgs.servers.frr: fix sbindir and remove FHS PATH
- introduce services.frr.openFilesLimit option
