Add warning when community and encryption keys match

edge.c

@@ -649,6 +649,9 @@ int main(int argc, char* argv[]) {
   if(tuntap_open(&tuntap, ec.tuntap_dev_name, ec.ip_mode, ec.ip_addr, ec.netmask, ec.device_mac, ec.mtu) < 0)
     return(-1);
 
+  if(conf.encrypt_key && !strcmp((char*)conf.community_name, conf.encrypt_key))
+    traceEvent(TRACE_WARNING, "Community and encryption key must differ, otherwise security will be compromised");
+
   if((eee = edge_init(&tuntap, &conf, &rc)) == NULL) {
     traceEvent(TRACE_ERROR, "Failed in edge_init");
     exit(1);