[debug] Change the default log level to LOGL_NOTICE

This marks the departure from printing all the debug messages to the console by
default.  We only print NOTICE and WARNING level messages by default

If you're interested in more details, you need to enable it via command
line options or the VTY
diff --git a/openbsc/src/debug.c b/openbsc/src/debug.c
index 1624e96..1aad133 100644
--- a/openbsc/src/debug.c
+++ b/openbsc/src/debug.c
@@ -33,26 +33,26 @@
 
 /* default categories */
 static struct debug_category default_categories[Debug_LastEntry] = {
-    [DRLL]	= { .enabled = 1, .loglevel = 0},
-    [DCC]	= { .enabled = 1, .loglevel = 0},
-    [DNM]	= { .enabled = 1, .loglevel = 0},
-    [DRR]	= { .enabled = 1, .loglevel = 0},
-    [DRSL]	= { .enabled = 1, .loglevel = 0},
-    [DMM]	= { .enabled = 1, .loglevel = 0},
-    [DMNCC]	= { .enabled = 1, .loglevel = 0},
-    [DSMS]	= { .enabled = 1, .loglevel = 0},
-    [DPAG]	= { .enabled = 1, .loglevel = 0},
-    [DMEAS]	= { .enabled = 0, .loglevel = 0},
-    [DMI]	= { .enabled = 0, .loglevel = 0},
-    [DMIB]	= { .enabled = 0, .loglevel = 0},
-    [DMUX]	= { .enabled = 1, .loglevel = 0},
-    [DINP]	= { .enabled = 1, .loglevel = 0},
-    [DSCCP]	= { .enabled = 1, .loglevel = 0},
-    [DMSC]	= { .enabled = 1, .loglevel = 0},
-    [DMGCP]	= { .enabled = 1, .loglevel = 0},
-    [DHO]	= { .enabled = 1, .loglevel = 0},
-    [DDB]	= { .enabled = 1, .loglevel = 0},
-    [DREF]	= { .enabled = 0, .loglevel = 0},
+    [DRLL]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DCC]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DNM]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DRR]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DRSL]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DMM]	= { .enabled = 1, .loglevel = LOGL_INFO },
+    [DMNCC]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DSMS]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DPAG]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DMEAS]	= { .enabled = 0, .loglevel = LOGL_NOTICE },
+    [DMI]	= { .enabled = 0, .loglevel = LOGL_NOTICE },
+    [DMIB]	= { .enabled = 0, .loglevel = LOGL_NOTICE },
+    [DMUX]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DINP]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DSCCP]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DMSC]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DMGCP]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DHO]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DDB]	= { .enabled = 1, .loglevel = LOGL_NOTICE },
+    [DREF]	= { .enabled = 0, .loglevel = LOGL_NOTICE },
 };
 
 struct debug_info {