vty: Provide logging set-log-mask, deprecate set log mask

There are no other commands on the set, log and mask level,
create a simple set-log-mask command and deprecate the old
way.
diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index b037a5b..7a59511 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -185,9 +185,10 @@
 
 DEFUN(logging_set_category_mask,
       logging_set_category_mask_cmd,
-      "logging set log mask MASK",
+      "logging set-log-mask MASK",
 	LOGGING_STR
-      "Decide which categories to output.\n")
+      "Set the logmask of this logging target\n"
+      "The logmask to use\n")
 {
 	struct log_target *tgt = osmo_log_vty2tgt(vty);
 
@@ -198,6 +199,14 @@
 	return CMD_SUCCESS;
 }
 
+ALIAS_DEPRECATED(logging_set_category_mask,
+		 logging_set_category_mask_old_cmd,
+		 "logging set log mask MASK",
+		 LOGGING_STR
+		 "Decide which categories to output.\n"
+		 "Log commands\n" "Mask commands\n" "The logmask to use\n");
+
+
 DEFUN(diable_logging,
       disable_logging_cmd,
       "logging disable",
@@ -560,6 +569,7 @@
 	install_element_ve(&logging_use_clr_cmd);
 	install_element_ve(&logging_prnt_timestamp_cmd);
 	install_element_ve(&logging_set_category_mask_cmd);
+	install_element_ve(&logging_set_category_mask_old_cmd);
 
 	/* Logging level strings are generated dynamically. */
 	logging_level_cmd.string = log_vty_command_string(cat);