It turns out that a host can have multiple valid default gateways,
something that's not common in ipv4.
This patches add supports for multiple default gateways in ipv6
environments.
Closes-Bug: #1786259
Change-Id: I30bf655f7160dd19c427ee79acdf145671a3e520
Signed-off-by: aojeagarcia <aojeagarcia@suse.com>