Ironic inspector should honour the Ansible inventory group
ironic-inspector. Ironic inspector may not be required at all. If
Ironic inspector is required then it should only run on a single
node, and this should be reflected by the inventory.

This change makes a number of Ironic inspector-related tasks dependent
upon the host's membership of the ironic-inspector group. Also, we
couple the ironic-dnsmasq container with the ironic-inspector group
rather than ironic-conductor, as the service is for inspector rather
than Ironic.

Change-Id: Ifd90753b0fe1a55c11b7723c28e1d14ab3d32737
Closes-Bug: #1665257

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>