[GPRS] gb_proxy: Initiate RESET procedure on persistent NS-VC at startup

Some BSS that connect to the proxy do not continue to perform the
RESET procedure after a timeout.  In order to resurrect them, we
simply start a RESET procedure.
diff --git a/openbsc/src/gprs/gb_proxy_main.c b/openbsc/src/gprs/gb_proxy_main.c
index f6260bf..de83186 100644
--- a/openbsc/src/gprs/gb_proxy_main.c
+++ b/openbsc/src/gprs/gb_proxy_main.c
@@ -237,6 +237,10 @@
 	nsip_connect(bssgp_nsi, &sin, gbcfg.nsip_sgsn_nsei,
 			gbcfg.nsip_sgsn_nsvci);
 
+
+	/* Reset all the persistent NS-VCs that we've read from the config */
+	gbprox_reset_persistent_nsvcs(bssgp_nsi);
+
 	while (1) {
 		rc = bsc_select_main(0);
 		if (rc < 0)