Create required freepool aggregate

For normal functioning of Blazar reservation it expects a nova agregate exist
to be used for host reservation.

Thus, to make deployment more convenient for deployer we add fuctionality
of creating such aggregate.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/904786
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-plugins/+/878794
Change-Id: I7f56b8c8f2394d5fae1476441c8e2e2a5f07467c

defaults/main.yml

@@ -39,9 +39,13 @@ blazar_pip_install_args: "{{ pip_install_options | default('') }}"
 blazar_venv_tag: "{{ venv_tag | default('untagged') }}"
 blazar_bin: "/openstack/venvs/blazar-{{ blazar_venv_tag }}/bin"
 
+# Blazar configuration
+
 blazar_etc_dir: /etc/blazar
 blazar_config_option: "--config-file {{ blazar_etc_dir }}/blazar.conf"
 
+blazar_nova_aggregate_name: freepool
+
 ## Common PIP requirements
 blazar_pip_packages:
   - "git+{{ blazar_git_repo }}@{{ blazar_git_install_branch }}#egg=blazar"

releasenotes/notes/blazar_aggregate_creation-29aec3d2a381ecb9.yaml

@@ -0,0 +1,8 @@
+---
+
+features:
+  - |
+    Added new variable ``blazar_nova_aggregate_name`` that allows to control
+    Nova aggregate name for Blazar.
+    When is not False (default value 'freepool'), aggregate in topic will
+    be created during deployment.

tasks/main.yml

@@ -196,3 +196,14 @@
     - _blazar_is_first_play_host
   tags:
     - always
+
+- name: Create required Nova aggregates
+  include_role:
+    name: openstack.osa.openstack_resources
+  vars:
+    openstack_resources_compute:
+      aggregates:
+        - name: "{{ blazar_nova_aggregate_name }}"
+          exclusive: "no"
+  when:
+    - blazar_nova_aggregate_name

templates/blazar.conf.j2

@@ -61,6 +61,7 @@ endpoint_type = internal
 
 [nova]
 endpoint_type = internal
+aggregate_freepool_name = {{ blazar_nova_aggregate_name }}
 
 [placement]
 endpoint_type = internal