net/iproute2: iproute2 flag handling
net/iproute2: iproute2 flag handling

Several of the optional flags were not being handled correctly, they
were being passed as values only, without the keyword before them.
Affected keywords: anycast, label, scope, valid_lft, preferred_lft

Also change the handling of keywords to a common setup now, making
broadcast and peer strings the same as the above keywords.

Signed-off-by: Robin H. Johnson <aa3b04a87f185a8b919ce94fe21b810489ffb8d4@gentoo.org>

dwfreed/openrc,OpenRC/openrc,williamh/openrc,OpenRC/openrc,OpenRC/openrc,dwfreed/openrc,dwfreed/openrc,williamh/openrc,williamh/openrc