selftests: add egress redirect test to mlxsw tc flower restrictions

Include test of forbidding to have redirect rule on egress-bound block.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>