[FROG] CNTRL+Z change

[mike tancsa]

Was just taking frr 8.3 for a spin and noticed it no longer acts the 
same way with respect to ctrl+z. From 7.x and before, when in config 
mode this took you out of config mode. Now it takes me right out of 
vtysh.  Is this a something that can be configured ? Base OS is FreeBSD 13

e.g. on 7.x

% sudo vtysh

Hello, this is FRRouting (version 7.5.1).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

frr-test# conf t
frr-test(config)# ^Z
frr-test# exit
%

on 8.3

if I hit ^Z in config mode, I just get punted back to the shell

0(test83)# vtysh

Hello, this is FRRouting (version 8.3).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

test83.sentex.ca# conf
test83.sentex.ca(config)#
test83.sentex.ca#
0(test83)#


     ---Mike