Standardize python version paths

This patch removes the hardcoded `distro_python_version`
mapping and usage from the configuration and templates,
aligning with the dynamic Python version detection
introduced in the dependent patch below.

The changes simplify the kolla-ansible roles by using
general `python3` paths, ensuring compatibility across
distributions without requiring version-specific handling.

Template files for Horizon, Ironic, Skyline, and others
have been updated to reflect this,
improving maintainability and reducing complexity.

Depends-On: https://review.opendev.org/c/openstack/kolla/+/926744
Change-Id: I85431b058b4184d96600cf17aaf8de871a018d61

ansible/group_vars/all.yml

@@ -1268,13 +1268,6 @@ influxdb_internal_endpoint: "{{ kolla_internal_fqdn | kolla_url(internal_protoco
 #########################
 # Internal Image options
 #########################
-distro_python_version_map: {
-  "centos": "3.9",
-  "debian": "3.11",
-  "rocky": "3.9",
-  "ubuntu": "3.10"
-}
-
 kolla_base_distro_version_default_map: {
   "centos": "stream9",
   "debian": "bookworm",
@@ -1282,7 +1275,7 @@ kolla_base_distro_version_default_map: {
   "ubuntu": "jammy",
 }
 
-distro_python_version: "{{ distro_python_version_map[kolla_base_distro] }}"
+distro_python_version: "3"
 
 kolla_base_distro_version: "{{ kolla_base_distro_version_default_map[kolla_base_distro] }}"
 

releasenotes/notes/standarize-python-version-paths-dec41acd66446168.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Global variable ``distro_python_version`` now defaults to `"3"`.

tests/templates/globals-default.j2

@@ -35,10 +35,6 @@ docker_custom_config:
 {% endif %}
 {% endif %}
 
-{% if kolla_python_version is defined and not is_previous_release %}
-distro_python_version: "{{ kolla_python_version }}"
-{% endif %}
-
 # MariaDB/Galera - fine tune timeouts
 mariadb_wsrep_extra_provider_options:
   - "gmcast.peer_timeout=PT15S"