gprs_ns2: rename gprs_ns2_ip_vc_sockaddr -> gprs_ns2_ip_vc_remote

It's more clear which part of the address is returned.
In preparation to add a gprs_ns2_ip_vc_local.

Change-Id: I6110ff573362961c713a990da7ef3f3dbedf6c57
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 92c0095..a457361 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -251,7 +251,7 @@
 
 	switch (nsvc->ll) {
 	case GPRS_NS_LL_UDP: {
-		sockaddr = gprs_ns2_ip_vc_sockaddr(nsvc);
+		sockaddr = gprs_ns2_ip_vc_remote(nsvc);
 		if (!sockaddr) {
 			vty_out(vty, "unknown");
 			break;