hide distro map since it is not configurable (#78068)

make it a private setting for internal use and avoid
 user confusion by not displaying it with normal configuration options

changelogs/fragments/hide_distro_map.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - configuration entry INTERPRETER_PYTHON_DISTRO_MAP is now 'private' and won't show up in normal configuration queries and docs, since it is not 'settable' this avoids user confusion.

lib/ansible/config/base.yml

@@ -1529,7 +1529,7 @@ INTERPRETER_PYTHON:
     installed later may change which one is used). This warning behavior can be disabled by setting ``auto_silent`` or
     ``auto_legacy_silent``. The value of ``auto_legacy`` provides all the same behavior, but for backwards-compatibility
     with older Ansible releases that always defaulted to ``/usr/bin/python``, will use that interpreter if present.
-INTERPRETER_PYTHON_DISTRO_MAP:
+_INTERPRETER_PYTHON_DISTRO_MAP:
   name: Mapping of known included platform pythons for various Linux distros
   default:
     redhat:

lib/ansible/executor/interpreter_discovery.py

@@ -58,7 +58,7 @@ def discover_interpreter(action, interpreter_name, discovery_mode, task_vars):
     is_silent = discovery_mode.endswith('_silent')
 
     try:
-        platform_python_map = C.config.get_config_value('INTERPRETER_PYTHON_DISTRO_MAP', variables=task_vars)
+        platform_python_map = C.config.get_config_value('_INTERPRETER_PYTHON_DISTRO_MAP', variables=task_vars)
         bootstrap_python_list = C.config.get_config_value('INTERPRETER_PYTHON_FALLBACK', variables=task_vars)
 
         display.vvv(msg=u"Attempting {0} interpreter discovery".format(interpreter_name), host=host)