Add setting telnet baud rate support (bin/173728)

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Handle ipv6_network_...="AUTO" correctly on route teardown

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Reintroduce change to optimize SUBDIR_OVERRIDE

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>