Make subunit2html.py Py3k compatible.

* modules/jenkins/files/slave_scripts/subunit2html.py: Since some
projects call this script from under tox, in a py33 environment it
won't work as intended. Correct multiple instances of print as a
statement rather than as a function.

Change-Id: I179d6aee976b033a45f483fd92f058a6079f8f46
Merge "Make subunit2html.py Py3k compatible."