use osmo_init_logging2() with proper talloc ctx

Since the logging allocations now also show up in the root context report, some
tests need adjusted talloc checks.

In msc_vlr_tests, also output the number of talloc blocks before tests are
started to show that the number didn't change after the tests.

Change-Id: Iae07ae60230c7bab28e52b5df97fa3844778158e
diff --git a/src/libgsupclient/gsup_test_client.c b/src/libgsupclient/gsup_test_client.c
index 03ba68e..0ebcd4a 100644
--- a/src/libgsupclient/gsup_test_client.c
+++ b/src/libgsupclient/gsup_test_client.c
@@ -289,10 +289,11 @@
 	unsigned long long i;
 	char *server_host = "127.0.0.1";
 	uint16_t server_port = OSMO_GSUP_PORT;
+	void *ctx = talloc_named_const(NULL, 0, "gsup_test_client");
 
-	osmo_init_logging(&gsup_test_client_log_info);
+	osmo_init_logging2(ctx, &gsup_test_client_log_info);
 
-	g_gc = gsup_client_create(NULL, "GSUPTEST", server_host, server_port,
+	g_gc = gsup_client_create(ctx, "GSUPTEST", server_host, server_port,
 				  gsupc_read_cb, NULL);