Correct the default cacti tree name

* modules/openstack_project/files/cacti/create_graphs.sh: At some
point, the default tree ceased being named "Default Tree" and became
"All Hosts" at which point new host nodes were no longer able to be
added to it. Correcting here should improve the situation for future
additions.

Change-Id: I4869a1d470497b120dd99c97677a7ae4dc26667f
Make novaclient-python33 gating

As of I33d9223b2202896331d24339056d57d4ca9acdc5 novaclient is passing
the python33 unit tests, so its time to gate!

Change-Id: If695f96bf08c272a4b09bc6bbd7c9ddcc2a33bcc
Closes-Bug: #1237093
Merge "Make novaclient-python33 gating"
Merge "Correct the default cacti tree name"