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We'll need this to do touchscreen (and other absolute) device testing
with real event dumps as input since the axis information must be valid.

Replace the shell script to capture capabilities with a python script,
because the absolute axis bounds aren't exposed in sysfs. We have
python-evdev on test images. Unfortunately it's a bit incomplete & buggy,
so fall back to sysfs for the missing & incorrect bits.

The "sw" field was accidently omitted previously and is now populated.

BUG=none
TEST=events_unittests

Review URL: https://codereview.chromium.org/1019793011

Cr-Commit-Position: refs/heads/master@{#322384}