Upon startup, the agent controller (cmk-agent-ctl) now checks if the
agent socket is operational on Unix systems. If not, we refuse the agent
registration (subcommands register, import), because a non-
operational socket can hint at xinetd systems. On such systems, a
successful registration would mislead the user into believing that the agent
communication is now TLS-encrypted, which is not the case.
Furthermore, the operational status of the agent socket is also reported by
the status subcommand.
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