stats: allow configuring reporter's name in the VTY

This allows configuring more than one reporter of the given type.

Change-Id: Ia815c24dc974648985539913012b3b074ea317a9
Related: SYS#5713
diff --git a/src/stats.c b/src/stats.c
index 0967305..702e408 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -106,7 +106,7 @@
 #define STATS_DEFAULT_INTERVAL 5 /* secs */
 #define STATS_DEFAULT_BUFLEN 256
 
-static LLIST_HEAD(osmo_stats_reporter_list);
+LLIST_HEAD(osmo_stats_reporter_list);
 static void *osmo_stats_ctx = NULL;
 static int is_initialised = 0;