Add example delete

Example delete command gets used like:
    python -m examples.delete openstack/network/v2_0/network.py \
           --data '{"id": "a1369557-748f-429c-bd3e-fc385aacaec7"}'

Change-Id: I03211b1e8f9c9efeb47c517d7e597acb8e7d6f59
Merge "Add example delete"