optionally do not send recovery with sgsnemu

According to 3GPP TS 29.060 recovery is optional, add command line option --norecovery to remove this field in sgsnemu

Signed-off-by: Yann BONNAMY <yann_bonnamy@yahoo.fr>
Signed-off-by: Harald Welte <laforge@gnumonks.org>
diff --git a/gtp/pdp.h b/gtp/pdp.h
index aea5df7..e3bd06d 100644
--- a/gtp/pdp.h
+++ b/gtp/pdp.h
@@ -198,6 +198,7 @@
   int    mstz_given;  /* MS Time Zone given*/
   struct ul255_t    imeisv;  /* IMEI Software Version */
   int    imeisv_given;  /* IMEI Software Version given*/
+  int    norecovery_given;  /* norecovery given*/
 
   /* Additional parameters used by library */