First, the environment variable for the child process was created but not
specified to subprocess.call().

Second, third_party/logilab/__init__.py tried to initialize itself with
pkg_resources.

TBR=chrisha@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10582031

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@143111 0039d316-1c4b-4281-b951-d872f2087c98