[Provingground] Update touch_firmware_versions script

Handle recently changed filenames by reducing specificity in the
regex which finds .ebuild files.  Also fix a longstanding bug where
some devices returned "var" or var" due to oddly formatted .ebuilds.

TEST=other than reef-uni changes and the bug fix, results are same

Change-Id: I494056508d8398ddb2aa86ee8ce84cfd33c645d3
Reviewed-on: https://chromium-review.googlesource.com/699235
Commit-Ready: Katherine Threlkeld <kathrelkeld@chromium.org>
Tested-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Reviewed-by: Vinayak Suley <vsuley@chromium.org>
1 file changed