Replace the attribute ip_address with public_address and
private_address where applicable. Current implementation is to
support private_address and public_address interchangeably until
TOSCA support for multiple (private and public) IP addresses is
implemented in the specification.
Change-Id: I020160d3e4f01bfc2214a2dbfa2cb4c1e3d49ce0
Closes-Bug: #1432085