This fixes a regression that was caused by switching from copy() to
deepcopy() when 'saving' variables before templating. Since HostVars
did not implement the __deepcopy__() method, deepcopy returned incorrect
results when host vars were present in the variables.
Fixes#63940
* Fix var_blending test temp dir usage.
* Fix filters integration test:
- Fix use of `output_dir`.
- Use `localhost` instead of `testhost` since we're only testing filters.
- Fix `fileglob` test to actually test a directory that exists.
* Fix lookups integration test:
- Fix use of `output_dir`.
- Use `localhost` instead of `testhost` since we're only testing lookups.
* Fix ansible-runner test temp dir usage.
* Fix template and template_jinja2_latest test.
Use the `OUTPUT_DIR` env var to get the output directory for the tests.
* Fix Python version compat in filters test.
* Skip filters test on Python 2.6.
