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

TrivialFix

Change-Id: I817aa52caf56b7d54b266e553db6db1ceb38b773
Signed-off-by: Jeffrey Zhang <zhang.lei.fly@gmail.com>