Replace raw_input with input to make PY3 compatible
Replace raw_input with input to make PY3 compatible

The raw_input() raises NameError: name 'raw_input' is not defined in python3.
This patch fixes it by replacing raw_input with input to make PY3 compatible.

Change-Id: I50aad3161893250dab1d60af4569bb65d7edef5a
Closes-Bug: #1595827

noironetworks/heat,noironetworks/heat,cwolferh/heat-scratch,openstack/heat,openstack/heat,cwolferh/heat-scratch