Make expect_tests yaml serialization support OrderedDict.
Make expect_tests yaml serialization support OrderedDict.

Not used for recipe simuliation tests (yet), but used for git numbering daemon
output.

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/330913003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@277078 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build