Adding DBG_LIB to all calls of libstrongswan's version of DBG*.

src/pluto/plutomain.c

@@ -244,7 +244,7 @@ static void print_plugins()
 		len += snprintf(&buf[len], BUF_LEN-len, "%s ", plugin);
 	}
 	enumerator->destroy(enumerator);
-	DBG1("loaded plugins: %s", buf);
+	DBG1(DBG_LIB, "loaded plugins: %s", buf);
 }
 
 int main(int argc, char **argv)