Switch from wsgi script to wsgi module

Change-Id: I6b3dee5740b04689d00ef01af636b5547c9d2aca

defaults/main.yml

@@ -137,6 +137,7 @@ placement_services:
     init_config_overrides: "{{ placement_api_init_overrides }}"
     start_order: 1
     wsgi_app: true
+    wsgi: "placement.wsgi.api:application"
     wsgi_name: placement-api
     uwsgi_overrides: "{{ placement_api_uwsgi_ini_overrides }}"
     uwsgi_bind_address: "{{ placement_bind_address }}"

vars/main.yml

@@ -58,7 +58,6 @@ uwsgi_placement_services: |-
          and ('wsgi_app' in value and value['wsgi_app']) %}
   {%     set _ = value.update(
             {
-             'wsgi_path':  placement_bin ~ '/' ~ value.wsgi_name,
              'wsgi_venv': ((placement_install_method == 'source') | ternary(placement_bin | dirname, None)),
              'uwsgi_uid': placement_system_user_name,
              'uwsgi_guid': placement_system_group_name,