Refactoring of inline-block-alignment tests

Hi,

I have submitted the new version of inline-block-alignment tests.

These tests has only two case (writing-mode:vertical-rl +
text-orientation:mixed). I'll submit other case in later.
I'll remove old test case and rename new test after new test case is
approved.

Commit
- https://hg.csswg.org/test/rev/e53afd19c2db
- https://hg.csswg.org/test/rev/45175a424209

Hajime.

-- 
# 塩澤 元 (Shiozawa, Hajime)
# mail: hajime.shiozawa@gmail.com