Remove unneeded remote addr

The remote address of mavproxy will be filled the first time an update
is received from mavproxy, so the initialization will be overwritten.
There is no data to be sent from the client before an initial message
arrives from mavproxy, so there is no need to initialize the address.

README.md

@@ -49,7 +49,7 @@ once with:
 2. In a third terminal, run Mavproxy:
 
     ```
-    mavproxy.py --master tcp:127.0.0.1:5760 --out udp:127.0.0.1:14550 --out udp:127.0.0.1:14556 --streamrate -1
+    mavproxy.py --master tcp:127.0.0.1:5760 --out udp:127.0.0.1:14556 --streamrate -1
     ```
 
     Load the Parameters on Mavproxy Prompt:

gzsitl/defines.hh

@@ -5,9 +5,7 @@
 #define GZSITL_TARGET_MODEL_NAME "gzsitl_target"
 #define DEBUG_STATE (true)
 #define DEBUG_MAVLINK (false)
-#define MAVPROXY_IP "127.0.0.1"
 #define MAVPROXY_PORT (14556)
-#define LOCAL_PORT (14550)
 #define DEFAULT_TARGET_SYSTEM_ID (1)    // Default Copter system ID
 #define DEFAULT_TARGET_COMPONENT_ID (1) // Default Copter component ID
 #define DEFAULT_SYSTEM_ID (22)          // This system ID

gzsitl/mavserver.cc

@@ -48,10 +48,6 @@ MavServer::MavServer(short port)
         close(sock);
         exit(EXIT_FAILURE);
     }
-
-    remote_addr.sin_family = AF_INET;
-    remote_addr.sin_addr.s_addr = inet_addr(MAVPROXY_IP);
-    remote_addr.sin_port = htons(LOCAL_PORT);
 }
 
 MavServer::~MavServer()