net: add large ecmp group nexthop tests

net: add large ecmp group nexthop tests

Add a couple large ecmp group nexthop selftests to cover
the remnant fixed by 6454fdb3ce4a4565c6ab089fa21a51a895dca19a.

The tests create 100 x32 ecmp groups of ipv4 and ipv6 and then
dump them. On kernels without the fix, they will fail due
to data remnant during the dump.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>