There is inconsistent use of either `/usr/bin/python` or
`/usr/bin/env python`. This makes for unexpected results when a
user might be using a virtualenv.
Change-Id: Ibb030f920a8869f9113ade70b66a921cc815060d
All json file in Kolla are json.j2 file, it shold be render as jinja
template, then validate by using json.
Change-Id: Ibabbe435116fd255d68347e00407156db76fedfe
Closes-Bug: #1634447