Fix Horizon 404 on Ubuntu

Change-Id: I6d0d9f1a79f319d53f08ea9cb0bedbd670da55c2
Closes-Bug: #1653011

ansible/roles/horizon/templates/horizon.conf.j2

-{% set python_path = '/usr/lib/python2.7/site-packages' if kolla_install_type == 'binary' else '/var/lib/kolla/venv/lib/python2.7/site-packages' %}
+{% set python_path = '/usr/share/openstack-dashboard' if kolla_install_type == 'binary' else '/var/lib/kolla/venv/lib/python2.7/site-packages' %}
 Listen {{ api_interface_address }}:80
 
 <VirtualHost *:80>