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Periodically checks socket object for new calls. This allows to function without special thread.
Interface is according JSON-RPC 2.0 Specification (see https://www.jsonrpc.org/specification)
Example calls:
printf '[{"jsonrpc": "2.0", "method": "active_profile", "id": 1}, {"jsonrpc": "2.0", "method": "profiles", "id": 2}]' | nc -U /run/tuned/tuned.sock
printf '{"jsonrpc": "2.0", "method": "switch_profile", "params": {"profile_name": "balanced"}, "id": 1}' | nc -U /run/tuned/tuned.sock
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