Try to find trunk/src/tools/python before importing google.path_utils. Don't require the buildbot slave_scripts unless running a test that needs them.
Try to find trunk/src/tools/python before importing google.path_utils.
Don't require the buildbot slave_scripts unless running a test that needs them.

BUG=none
TEST=run 'smoketests.py --tests=ui' without having tools\buildbot\scripts\slave
    checked out
Review URL: http://codereview.chromium.org/174191

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@23922 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser