Fix Ubuntu installation notes on KB
The installation procedure here: https://kb.isc.org/docs/kea-build-on-ubuntu needs some corrections and updates.
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it still mentions --with-tier2 (which was removed in 1.4.0)
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the Radius installation section mentions FreeRADIUS client being installed from the upstream. Francis did some important (segfault preventing) fixes in his version. See https://jenkins.isc.org/job/Kea_doc/guide/kea-guide.html#hooks-radius. It may be ok to use the upstream if they accepted Francis' patches and released fixed version.
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It doesn't cover NETCONF. This is pretty important, because sysrepo is pretty darn tricky to install and Ubuntu happens to be a least painful system to get it on.