change default port to 5002

As in the previous version. Fixes #214.

shairport.c

@@ -137,7 +137,7 @@ int main(int argc, char **argv) {
 
     // set defaults
     config.buffer_start_fill = 220;
-    config.port = 9000;
+    config.port = 5002;
     char hostname[100];
     gethostname(hostname, 100);
     config.apname = malloc(20 + 100);