Add example get

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

Change-Id: Idd8e9ecc1c33ef929add162cf61ec894856cb851
Merge "Add example get"