sw test tool: fix wrong instruction(write metadata) value of test files

The value of instruction(write metadata) of the test file is wrong.
In the table-miss test of of13/match/02_METADATA* test files,
 metadata=255 or 240(mask=0xf0) is specified as match.
In order to make it table-miss, it needed to write metadata except 255.

Signed-off-by: WATANABE Fumitaka <watanabe.fumitaka1@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
sw test tool: fix wrong match(ipv6_exthdr) value of test file

The value of match(ipv6_exthdr) of the
 of13/match/39_IPV6_EXTHDR.json test file is wrong.
The correct value matching to a ipv6(ext_hdrs=[hop_opts,auth])
 is ipv6_exthdr=001000100=68.
This patch corrects it.

Signed-off-by: WATANABE Fumitaka <watanabe.fumitaka1@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>