Handle SIGHUP during initialisation phase

Without this commit, if remote host cannot be reached, we get stuck in loop trying to connect and we cannot reload a new configuration using SIGHUP.
In this case, the only way to reload the configuration is to kill and relaunch the daemon.

With this commit, following use case can be done:
- Set a good config file
- Launch vpn client daemon -> Connect OK
- Change config file (configure a wrong remote host)
- SIGHUP
- client daemon reload conf -> Connect failed and loop retrying connection
- Change config file (configure a good remote host)
- SIGHUP
- client daemon reload conf -> Connect OK

---
 src/openvpn/sig.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index b3ae645..073a285 100644
@@ -226,7 +226,7 @@ pre_init_signal_catch (void)
   signal_mode = SM_PRE_INIT;
   signal (SIGINT, signal_handler);
   signal (SIGTERM, signal_handler);
-  signal (SIGHUP, SIG_IGN);
+  signal (SIGHUP, signal_handler);
   signal (SIGUSR1, SIG_IGN);
   signal (SIGUSR2, SIG_IGN);
   signal (SIGPIPE, SIG_IGN);

1.7.9.5