change default port to 5002

As in the previous version. Fixes mikebrady#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);