Updates Nova under training labs

Updates to nova, fixes some of the issues present in the scripts.

Changes the compute package from "nova-compute-kvm" to
"nova-compute-qemu".

Fixes Bug 1312764
Implements Blueprint: openstack-training-labs
Change-Id: Id3a2dc5f06921f803e07ef2dc8c4dbf64ea508be
Merge "Updates Nova under training labs"