This was related to bug 1298929. Basically the nodepool image build for this type and provider ran into...
2014-03-28 02:34:29,629 INFO nodepool.image.build.hpcloud-region-b.py3k-precise: ssl.CertificateError: hostname 'pypi.python.org' doesn't match either of '*.c.ssl.fastly.net', 'c.ssl.fastly.net', '*.target.com'
...when trying to download tox. However it didn't abort the build, so resulting nodes from that image lacked a tox executable. I have since deleted the problem image and we've reverted to launching nodes from the previous day's image instead.
This was related to bug 1298929. Basically the nodepool image build for this type and provider ran into...
2014-03-28 02:34:29,629 INFO nodepool. image.build. hpcloud- region- b.py3k- precise: ssl.Certificate Error: hostname 'pypi.python.org' doesn't match either of '*.c.ssl. fastly. net', 'c.ssl.fastly.net', '*.target.com'
...when trying to download tox. However it didn't abort the build, so resulting nodes from that image lacked a tox executable. I have since deleted the problem image and we've reverted to launching nodes from the previous day's image instead.