rework some of ansible's inner templating

[bcoca]

• vars is now a template object that is autosolvable
  also 'fixes' vars['varname'] not being templated.
• avoid full vars dict copy now for every get_vars call.
• moved to use common object for hostvarsvars as for vars.

related #72829

ISSUE TYPE

• Bugfix Pull Request
• Feature Pull Request

COMPONENT NAME

vars

[ansibot]

The test ansible-test sanity --test package-data [explain] failed with the error:

Command "/root/.ansible/test/venv/sanity.package-data/3.10/431ccf3c/bin/python /root/ansible/test/sanity/code-smell/package-data.py" returned exit status 1.
>>> Standard Error
Traceback (most recent call last):
  File "/root/ansible/test/sanity/code-smell/package-data.py", line 383, in <module>
    main()
  File "/root/ansible/test/sanity/code-smell/package-data.py", line 360, in main
    sdist_path = create_sdist(tmp_dir)
  File "/root/ansible/test/sanity/code-smell/package-data.py", line 174, in create_sdist
    raise Exception('make snapshot failed:\n%s' % stderr)
Exception: make snapshot failed:
Traceback (most recent call last):
  File "/tmp/tmpu7mad4ph/hacking/build-ansible.py", line 103, in <module>
    main()
  File "/tmp/tmpu7mad4ph/hacking/build-ansible.py", line 92, in main
    retval = command.main(args)
  File "/tmp/tmpu7mad4ph/hacking/build_library/build_ansible/command_plugins/generate_man.py", line 279, in main
    allvars[cli_name] = opts_docs(cli_class_name, cli_name)
  File "/tmp/tmpu7mad4ph/hacking/build_library/build_ansible/command_plugins/generate_man.py", line 119, in opts_docs
    cli_klass = getattr(__import__("ansible.cli.%s" % cli_module_name,
  File "/tmp/tmpu7mad4ph/lib/ansible/cli/config.py", line 25, in <module>
    from ansible.parsing.yaml.dumper import AnsibleDumper
  File "/tmp/tmpu7mad4ph/lib/ansible/parsing/yaml/dumper.py", line 30, in <module>
    from ansible.vars.hostvars import HostVars, HostVarsVars
ImportError: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/tmp/tmpu7mad4ph/lib/ansible/vars/hostvars.py)
make: *** [Makefile:190: generate_rst] Error 1

The test ansible-test sanity --test docs-build [explain] failed with the error:

Command "/root/.ansible/test/venv/sanity.docs-build/3.10/966adace/bin/python /root/ansible/test/sanity/code-smell/docs-build.py" returned exit status 1.
>>> Standard Error
Command 'make core_singlehtmldocs' failed with status code: 2
--> Standard Output
Creating symlinks in core_structure
ln -sf ../rst/core_index.rst rst/index.rst
ln -sf ../sphinx_conf/core_conf.py rst/conf.py
../../hacking/build-ansible.py collection-meta --template-file=../templates/collections_galaxy_meta.rst.j2 --output-dir=rst/dev_guide/  ../../lib/ansible/galaxy/data/collections_galaxy_meta.yml
../../hacking/build-ansible.py document-config --template-file=../templates/config.rst.j2 --output-dir=rst/reference_appendices/  ../../lib/ansible/config/base.yml
mkdir -p rst/cli
../../hacking/build-ansible.py generate-man --template-file=../templates/cli_rst.j2 --output-dir=rst/cli/ --output-format rst  ../../lib/ansible/cli/*.py
--> Standard Error
Traceback (most recent call last):
  File "/root/ansible/docs/docsite/../../hacking/build-ansible.py", line 103, in <module>
    main()
  File "/root/ansible/docs/docsite/../../hacking/build-ansible.py", line 92, in main
    retval = command.main(args)
  File "/root/ansible/hacking/build_library/build_ansible/command_plugins/generate_man.py", line 279, in main
    allvars[cli_name] = opts_docs(cli_class_name, cli_name)
  File "/root/ansible/hacking/build_library/build_ansible/command_plugins/generate_man.py", line 119, in opts_docs
    cli_klass = getattr(__import__("ansible.cli.%s" % cli_module_name,
  File "/root/ansible/lib/ansible/cli/config.py", line 25, in <module>
    from ansible.parsing.yaml.dumper import AnsibleDumper
  File "/root/ansible/lib/ansible/parsing/yaml/dumper.py", line 30, in <module>
    from ansible.vars.hostvars import HostVars, HostVarsVars
ImportError: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/root/ansible/lib/ansible/vars/hostvars.py)
make: *** [Makefile:192: cli] Error 1

The test ansible-test sanity --test ansible-doc [explain] failed with the error:

Command "ansible-doc -t become runas su sudo" returned exit status 250.
>>> Standard Error
ERROR! Unexpected Exception, this is probably a bug: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/root/ansible/lib/ansible/vars/hostvars.py)

The test ansible-test sanity --test import --python 3.9 [explain] failed with 1 error:

lib/ansible/plugins/filter/core.py:34:0: traceback: ImportError: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/root/ansible/lib/ansible/vars/hostvars.py) (at lib/ansible/parsing/yaml/dumper.py:30:0)

The test ansible-test sanity --test import --python 3.8 [explain] failed with 1 error:

lib/ansible/plugins/filter/core.py:34:0: traceback: ImportError: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/root/ansible/lib/ansible/vars/hostvars.py) (at lib/ansible/parsing/yaml/dumper.py:30:0)

The test ansible-test sanity --test import --python 3.10 [explain] failed with 1 error:

lib/ansible/plugins/filter/core.py:34:0: traceback: ImportError: cannot import name 'HostVarsVars' from 'ansible.vars.hostvars' (/root/ansible/lib/ansible/vars/hostvars.py) (at lib/ansible/parsing/yaml/dumper.py:30:0)

The test ansible-test sanity --test pylint [explain] failed with 1 error:

test/sanity/ignore.txt:131:1: ansible-test: Ignoring 'disallowed-name' on 'lib/ansible/vars/hostvars.py' is unnecessary

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