The accumulated collected_facts was being update
with new facts _after_ filtering them. So only
facts that pass the filter would ever be passed
to other fact collectors.
For 'filter=ansible_service_mgr', even though it requires
the platform and distribution facts and even collects them,
they would get filtered out and never passed to the other
collectors that need them (service_mgr for ex).
Fix is just to add the unfiltered facts to collected_facts.
Adds unit tests for fact filter and collected_facts.
Fixes#32286
It was in lib/ansible/modules/system/setup.py since it
was the only thing using it, but move it back to module_utils
and add a ansible_collector.get_ansible_collector() to build
a facts collector just like the one used by setup.py
mv test_setup.py -> test_ansible_collector.py
All the code it was testing is now in ansible_collector
rm code to create 'ansible_facts' subkey from namespace
Just leave it up to the caller to do, and just return a
flat dictionary from AnsibleFactCollector.collect()
Adrian Likins