Add service-uwsgi-config role

This role is a standard service role to be used in all
respective services roles to generate uwsgi configuration.

It is mainly based on Devstack configuration template.

Change-Id: I46af6ff709dff4f7a0942df4dadf001c653f44fa

ansible/roles/service-uwsgi-config/defaults/main.yml

@@ -0,0 +1,8 @@
+---
+service_uwsgi_config_host: "{{ api_interface_address | put_address_in_context('url') }}"
+service_uwsgi_config_file: "{{ node_config_directory }}/{{ service_name }}/{{ service_name }}-uwsgi.ini"
+service_uwsgi_config_log_dir: "{{ ansible_parent_role_names | first }}"
+service_uwsgi_config_log_file: "{{ service_name }}-uwsgi.log"
+service_uwsgi_config_tls_backend: false
+service_uwsgi_config_worker_timeout: 80
+service_uwsgi_config_workers: "{{ openstack_service_workers }}"

ansible/roles/service-uwsgi-config/tasks/main.yml

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+---
+- name: "Copying over {{ service_name }} uWSGI config"
+  template:
+    src: "uwsgi.ini.j2"
+    dest: "{{ service_uwsgi_config_file }}"
+    mode: "0660"
+  become: true
+  notify:
+    - Restart {{ service_name }} container

ansible/roles/service-uwsgi-config/templates/uwsgi.ini.j2

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+[uwsgi]
+add-header = Connection: close
+buffer-size = 65535
+die-on-term = true
+enable-threads = true
+exit-on-reload = false
+hook-master-start = unix_signal:15 gracefully_kill_them_all
+{% if service_uwsgi_config_tls_backend | bool %}
+https = {{ service_uwsgi_config_host }}:{{ service_uwsgi_config_http_port }},{{ service_uwsgi_config_tls_cert }},{{ service_uwsgi_config_tls_key }}
+{% else %}
+http = {{ service_uwsgi_config_host }}:{{ service_uwsgi_config_http_port }}
+{% endif %}
+lazy-apps = true
+logto2 = /var/log/kolla/{{ service_uwsgi_config_log_dir }}/{{ service_uwsgi_config_log_file }}
+master = true
+{% if service_uwsgi_config_module is defined %}
+module = {{ service_uwsgi_config_module }}
+{% elif service_uwsgi_config_wsgi_file is defined %}
+wsgi-file = {{ service_uwsgi_config_wsgi_file }}
+{% endif %}
+plugins-dir = {{ '/usr/lib/uwsgi/plugins' if kolla_base_distro in ['ubuntu', 'debian'] else '/usr/lib64/uwsgi' }}
+plugins = python3
+processes = {{ service_uwsgi_config_workers }}
+thunder-lock = true
+{% if service_uwsgi_config_uid is defined %}
+uid = {{ service_uwsgi_config_uid }}
+{% endif %}
+worker-reload-mercy = {{ service_uwsgi_config_worker_timeout }}

releasenotes/notes/service-uwsgi-config-cf82829aa6457a92.yaml

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+---
+features:
+  - |
+    ``service-uwsgi-config`` role has been introduced for configuring uWSGI.