link: display 'allmulti' counter

This counter is based on the same principle that the 'promiscuity' counter:
the flag ALLMULTI is displayed only when it is explicitly requested by the
userland. This counter enables to know if 'allmulti' is configured on an
interface.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
1 file changed