qa_tripleo.sh: Fix testenv jsonfile creation

Nodes are automatically added by create-nodes script. No need to do it
manually.
qa_tripleo.sh: Move tripleo-ci git clone

Use /opt/stack/new as tripleo-ci git clone destination. That's what
other git clones use as well.
Merge pull request #110 from toabctl/fix-testenv-datafile

qa_tripleo.sh: Fix testenv jsonfile creation