Check tox runs for sudo attempts.
Check tox runs for sudo attempts.

If Jenkins has attempted to sudo during a tox run, fail the
test.

Also, remove "-e" from run-tox, so that pip freeze always runs.

Change-Id: I98230e4de03667f15f119fac45e1eba0ac249c1c
Reviewed-on: https://review.openstack.org/12458
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

open-switch/infra_puppet-jenkins,open-switch/infra_puppet-jenkins