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example:
$ kdig @a.root-servers.net +short +tcp DNSKEY . > root.key
$ kresd -k root.key

`kresd -a 127.0.0.1 -a ::1` binds to both addresses

the reason is that it's not actively used since we moved to binary
testing, and it depends on libknot internal api that has changed
also removed several unused libknot internal headers

previously, debug messages were optional with -DWITH_DEBUG
now the debug messages are built in (unless compiled with -DNDEBUG), but
disabled by default

verbose output can be enabled by '-v' or '--verbose' CLI option
or interactively by 'verbose(true|false)' (or in config)

fixes killing the server with SIGKILL causing abortiong,
added SIGTERM handler and ignored retcode from uv_run()

this is a first step of leaning towards LuaJIT.
the FFI bindings are much faster, simpler and don’t abort traces

daemon core scripting engine is still going to support interpreted Lua, but modules requiring library bindings (such as ‘block’) will require LuaJIT for FFI

fixed CID#125374

this fixes an issue with libuv sometimes crashing with mismatching number
of descriptors with REUSEPORT

when the daemon starts in non-interactive mode, it creates a pipe in the ‘tty/<pid>’ which can be used to interact with it remotely - much wow

e.g. $ socat - UNIX-CONNECT:tty/38284

this LRU-like cache tracks lame nameservers, unresolvable
nameservers (to not waste resources in trying to resolve them),
and possibly other features (extension support, …)

This reverts commit 91a2945e.

Conflicts:
	daemon/worker.h

this avoids repetitive allocation/free cycles on load

lists available interfaces

The engine is responsible for central managemento of resources and work
distribution. This allows to spawn multiple loops.

The engine configuration / interface is based on Lua 5.1-5.2, including
a RPC and a simple CLI interface. This is going to be the core of configuration
later on.