gbproxy/vty: Enhance delete-gbproxy-peer command

This adds the option to delete all BVC peers and/or NS_VC with a
given NSEI with a single command. Static (configured) NS-VC are not
affected. In addition, all connections for this NSEI that can be
deleted by this command can be listed without deleting them by
appending 'dry-run' to the command.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gb_proxy_vty.c b/openbsc/src/gprs/gb_proxy_vty.c
index 176ea65..82d49ca 100644
--- a/openbsc/src/gprs/gb_proxy_vty.c
+++ b/openbsc/src/gprs/gb_proxy_vty.c
@@ -80,7 +80,8 @@
 {
 	install_element_ve(&show_gbproxy_cmd);
 
-	install_element(ENABLE_NODE, &delete_gb_cmd);
+	install_element(ENABLE_NODE, &delete_gb_bvci_cmd);
+	install_element(ENABLE_NODE, &delete_gb_nsei_cmd);
 
 	install_element(CONFIG_NODE, &cfg_gbproxy_cmd);
 	install_node(&gbproxy_node, config_write_gbproxy);