add f_vty_config3(), to run N commands on a sub-node

f_vty_config2() makes it convenient to enter a specific vty node without
needing to send 'exit'/'end' explicitly. However, to pass multiple
commands on the same node, the VTY would enter and exit the node for
each call of f_vty_config2(). The new f_vty_config3() also allows
multiple commands to be run on that same node without intermediate
exiting.

Change-Id: If969ac645aa82e5a36245d974de2a251633de111
1 file changed