Fix issue #39, configure interfaces after daemonization, as otherwise we

loose the ALLMULTI flag on the listening interfaces during the whole process.
Probable cause is the parent restoring the original state of the interface
flags before exitting.

src/ndppd.cc

@@ -351,9 +351,6 @@ int main(int argc, char* argv[], char* env[])
     if (cf.is_null())
         return -1;
 
-    if (!configure(cf))
-        return -1;
-
     if (daemon) {
         logger::syslog(true);
 
@@ -361,6 +358,9 @@ int main(int argc, char* argv[], char* env[])
             return 1;
     }
 
+    if (!configure(cf))
+        return -1;
+
     if (!pidfile.empty()) {
         std::ofstream pf;
         pf.open(pidfile.c_str(), std::ios::out | std::ios::trunc);