add operator==, remoteIP and remotePort to EthernetClient

(Filtered from arduino/Arduino@ca37de4)

Author: ntruchsess

core/Client.h

@@ -19,6 +19,8 @@ class Client : public Stream {
   virtual void stop() = 0;
   virtual uint8_t connected() = 0;
   virtual operator bool() = 0;
+  virtual IPAddress remoteIP() = 0;
+  virtual uint16_t remotePort() = 0;
 protected:
   uint8_t* rawIPAddress(IPAddress& addr) { return addr.raw_address(); };
 };