Updated openstack/openstack
Project: openstack/heat  b857f7cc858776c26492a021ecf9f3a1db77dd38

Convert unicode to six.text_type in heat/api

This patch convert unicode to six.text_type in
heat/api for python 3.x compatibility.

Change-Id: I8a1f88ebaac64daa2ba074407fa682dff00f2371