client: move waitAny to the Main API section

Method `Connector::waitAny` is somewhy placed at the service interfaces
section, but it's not used internally at all - this method actually
belongs to the public API. Let's move it there.

Author: drewdzzz

src/Client/Connector.hpp

@@ -80,8 +80,8 @@ class Connector
 		    const std::vector<rid_t > &futures, int timeout = 0);
 	int waitCount(Connection<BUFFER, NetProvider> &conn,
 		      size_t feature_count, int timeout = 0);
-	////////////////////////////Service interfaces//////////////////////////
 	std::optional<Connection<BUFFER, NetProvider>> waitAny(int timeout = 0);
+	////////////////////////////Service interfaces//////////////////////////
 	void readyToDecode(const Connection<BUFFER, NetProvider> &conn);
 	void readyToSend(const Connection<BUFFER, NetProvider> &conn);
 	void finishSend(const Connection<BUFFER, NetProvider> &conn);