wsgi scripts shouldn't grant on /usr/bin

[Corey Bryant]

cdent mentioned this:

<cdent> coreycb: as a somewhat related aside: I think the wsgi script should not be in /usr/bin and the Directory statement should not grant on /usr/bin, but whatever the wsgi script dir is. It is pbr that is in the habit of installing the wsgi script in /usr/bin or /usr/local/bin and that's probably bad.

It does seems sensible to limit the access granted to something more minimal than /usr/bin.

For reference:
https://httpd.apache.org/docs/2.4/howto/access.html

This affects the nova-placement-api. https://git.launchpad.net/~ubuntu-server-dev/ubuntu/+source/nova/tree/debian/nova-placement-api.conf?h=stable/ocata

This affects more than just nova. We should revisit all of our packages that have wsgi scripts.