Extract kas-specific gateway finder logic
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Extract kas-specific gateway finder logic
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Move interface
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Rename tunnelQuerier -> gatewayQuerier
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Rename PollingQuerier -> PollingGatewayURLQuerier, methods
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Rename PollKasUrlsByAgentIdCallback -> PollGatewayURLsCallback
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Rename findReadyTunnel -> findReadyGateway
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Tunnel -> Gateway in the test
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Turn GatewayFinder into an interface
Relates to #496 (closed).