Fix to servo version string getter.

Consolidated 2 functions to get servo version and fixed typo to in
logging message.

BUG=chromium:351062
TEST=None

Change-Id: Ib4303bf5bec77a375a4b80db7b581b3c8fcc545e
Reviewed-on: https://chromium-review.googlesource.com/189500
Tested-by: Yusuf Mohsinally <mohsinally@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Commit-Queue: Yusuf Mohsinally <mohsinally@chromium.org>
1 file changed