Change in flashrom[staging]: Hack up test_v2.sh to work better with upstream

[David Hendricks (Code Review)]

David Hendricks has posted comments on this change. ( https://review.coreboot.org/19341 )

Change subject: Hack up test_v2.sh to work better with upstream
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Patch Set 1:

Note: In order for this to work we need:
- Add -i <region][:<file>] support (next patch in series)
- make args for -r/-w/-v non-positional and optional (https://gerrit.chromium.org/gerrit/60515, to be ported)
- Maybe other stuff?