Move AcceptedConnection class to rpcserver.h.

Also, add parens to HTTPReply() to assist readability.

src/rpcserver.h

@@ -21,6 +21,16 @@
 class CBlockIndex;
 class CNetAddr;
 
+class AcceptedConnection
+{
+public:
+    virtual ~AcceptedConnection() {}
+
+    virtual std::iostream& stream() = 0;
+    virtual std::string peer_address_to_string() const = 0;
+    virtual void close() = 0;
+};
+
 /* Start RPC threads */
 void StartRPCThreads();
 /* Alternative to StartRPCThreads for the GUI, when no server is