of1.2: fix OFPQueueProp parser

- add OFP_QUEUE_PROP_HEADER_SIZE to offset of argument of propreties class.

Signed-off-by: KONDOH Tasuku <kondoh.tasuku@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>