switch: Set pGW/GGSN address from GTP-C

Create-Session-Response & Create-PDP-Response are referencing remote
pGW & GGSN allocated during creation. This IP address MUST be used
instead of using L3 ip src. When running topologies with GTP router,
firewall or loadbalancer IP preset in GTP-C are mostly to be
different from ip present in layer3.

src/gtp_switch_hdl_v1.c

@@ -397,7 +397,8 @@ gtp1_create_pdp_response_hdl(gtp_server_worker_t *w, struct sockaddr_storage *ad
 	gtp_sqn_restore(w, teid->peer_teid);
 
 	/* Set addr tunnel endpoint */
-	gtp_teid_update_pgw(teid, addr);
+	inet_ip4tosockaddr(teid->ipv4, (struct sockaddr_storage *) &teid->pgw_addr);
+	teid->pgw_addr.sin_port = htons(GTP_C_PORT);
 	teid->sgw_addr = t->sgw_addr;
 
 	/* Test cause code, destroy if <> success.

src/gtp_switch_hdl_v2.c

@@ -440,7 +440,8 @@ gtpc_create_session_response_hdl(gtp_server_worker_t *w, struct sockaddr_storage
 	gtp_sqn_restore(w, teid->peer_teid);
 
 	/* Set addr tunnel endpoint */
-	teid->pgw_addr = *((struct sockaddr_in *) addr);
+	inet_ip4tosockaddr(teid->ipv4, (struct sockaddr_storage *) &teid->pgw_addr);
+	teid->pgw_addr.sin_port = htons(GTP_C_PORT);
 	teid->sgw_addr = t->sgw_addr;
 
 	/* Test cause code, destroy if <> success.