Changes

VTY: Initialize fields of struct cmd_element in order of declaration

gpp requires designated initialisers to be initialized in the order
their fields were declared. With this patch it is possible to include
VTY's command.h within C++ code.

Change-Id: Ifaa31980f149f9c1f1a9b28f318a4850f6855472
(cherry picked from commit c59d99352c1903adcc84fbd54c2a60c410a6ad31)