Use api-paste.ini from /etc/neutron

CentOS binary packages for Xena have moved Neutron's api-paste.ini file
to /etc/neutron [1]. Ubuntu packages already provide this file at this
location. Source images should also have api-paste.ini installed there.

[1] https://review.rdoproject.org/r/c/openstack/neutron-distgit/+/34845

Depends-On: https://review.opendev.org/c/openstack/kolla/+/804269

Change-Id: Ideb0247578afb8cc36bb6ac26d8ef7fda494bee3

ansible/roles/neutron/templates/neutron.conf.j2

@@ -15,7 +15,7 @@ bind_host = {{ api_interface_address }}
 
 bind_port = {{ neutron_server_listen_port }}
 
-api_paste_config = /usr/share/neutron/api-paste.ini
+api_paste_config = /etc/neutron/api-paste.ini
 
 api_workers = {{ openstack_service_workers }}
 metadata_workers = {{ openstack_service_workers }}