logging: Make sure to install standard "end" command in VTY node
When you are in the config-log VTY node, you expect "end" to work
like in any other sub-node of config.
diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index 971ec3b..d473f12 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -592,6 +592,8 @@
install_element_ve(&show_logging_vty_cmd);
install_node(&cfg_log_node, config_write_log);
+ install_default(CFG_LOG_NODE);
+ install_element(CFG_LOG_NODE, &config_end_cmd);
install_element(CFG_LOG_NODE, &logging_fltr_all_cmd);
install_element(CFG_LOG_NODE, &logging_use_clr_cmd);
install_element(CFG_LOG_NODE, &logging_prnt_timestamp_cmd);