Remove the awk based ifconfig output handling violence (omg) and instead
use the ip utility and its JSON output: this uses the available
system utility jsonfilter. Much cleaner and less brittle.
This fixes alias interface handling
Fixes issue #24922
Add dep 'ip' (iproute2: ip-tiny, ip-full)
Signed-off-by: Paul Donald <newtwen+github@gmail.com>