Clean up Python installation module

Moved temporary files generated by the Python module into its
own sub-directory in /var/python276.  This will prevent tmpwatch
from cleaninup up the tmp files generated by the Python module
which is needed to keep Puppet from trying to re-install Python.
Added extra check to see what version of Python is installed to
prevent unnecessary runs if the Python tmp files are deleted.

Updated pyodbc version to our modified version.

Pinned tox at 1.6.1 in the jenkins:slave module. Otherwise
this caused tox to keep switching between the latest version and
version 1.6.1 on every puppet run.

Change-Id: I0cab7bab1e9053c516602d6a105ab70dff2448b3
Merge "Clean up Python installation module"