make sure we don't have namespace clashes between libraries and apps

* All loging prefixes in libraries should be DL like DLINP
* All signals / subsystems should be called S_L_* SS_L_*
* All command nodes should be called L_*_NODE

This makes sure existinc code still compiles as expected
diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index 04692d3..20c1254 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -39,12 +39,12 @@
 /* logging levels defined by the library itself */
 #define DLGLOBAL	-1
 #define DLLAPDM		-2
-#define DINP		-3
-#define DMUX		-4
-#define DMI		-5
-#define DMIB		-6
-#define DRSL		-7
-#define DNM		-8
+#define DLINP		-3
+#define DLMUX		-4
+#define DLMI		-5
+#define DLMIB		-6
+#define DLRSL		-7
+#define DLNM		-8
 #define OSMO_NUM_DLIB	9
 
 struct log_category {
diff --git a/include/osmocom/core/signal.h b/include/osmocom/core/signal.h
index 7c32c77..2442e51 100644
--- a/include/osmocom/core/signal.h
+++ b/include/osmocom/core/signal.h
@@ -11,8 +11,8 @@
 
 /* signal subsystems. */
 enum {
-	SS_GLOBAL		= OSMO_SIGNAL_SS_RESERVED,
-	SS_INPUT,
+	SS_L_GLOBAL		= OSMO_SIGNAL_SS_RESERVED,
+	SS_L_INPUT,
 };
 
 /* application-defined signal types. */
@@ -21,7 +21,7 @@
 
 /* signal types. */
 enum {
-	S_GLOBAL_SHUTDOWN	= OSMO_SIGNAL_T_RESERVED,
+	S_L_GLOBAL_SHUTDOWN	= OSMO_SIGNAL_T_RESERVED,
 };
 
 typedef int osmo_signal_cbfn(unsigned int subsys, unsigned int signal, void *handler_data, void *signal_data);
diff --git a/include/osmocom/vty/command.h b/include/osmocom/vty/command.h
index 4104d76..a6c2c5c 100644
--- a/include/osmocom/vty/command.h
+++ b/include/osmocom/vty/command.h
@@ -74,8 +74,8 @@
 
 	VTY_NODE,		/* Vty node. */
 
-	E1INP_NODE,		/* E1 line in libosmo-abis. */
-	IPA_NODE,		/* IPA proxying commands in libosmo-abis. */
+	L_E1INP_NODE,		/* E1 line in libosmo-abis. */
+	L_IPA_NODE,		/* IPA proxying commands in libosmo-abis. */
 
 	_LAST_OSMOVTY_NODE
 };