dissolve libcommon: drop debug.c

Apply more concise logging categories in each main scope. The bulk goes to
msc_main.c, obviously, while tests and utils get a slimmed down bunch of
logging categories.

Change-Id: I969a0662ba273f3721b6820d02151b7a5b8014b8
diff --git a/src/libcommon/gsup_test_client.c b/src/libcommon/gsup_test_client.c
index 8b6199e..3e88689 100644
--- a/src/libcommon/gsup_test_client.c
+++ b/src/libcommon/gsup_test_client.c
@@ -8,10 +8,10 @@
 #include <osmocom/core/select.h>
 #include <osmocom/core/application.h>
 #include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
 #include <osmocom/gsm/gsup.h>
 
 #include <osmocom/msc/gsup_client.h>
-#include <osmocom/msc/debug.h>
 
 static struct gsup_client *g_gc;