* InventoryManager start of perf improvements
* 0 not 1
* More startswith to [0] improvements
* Remove unused var
* The hash doesn't need to be a string, start as a list, make it into a tuple
* set actually appears faster than frozenset, and these don't need to be frozen
* Cache hosts lists, to avoid extra get_hosts calls, pass to get_vars too
* negligible perf improvement, it could help with memory later
* Try the fast way, fallback to the safe way
* Revert to previous logic, linting fix
* Extend pre-caching to free
* Address test failures
* Hosts are strings
* Fix unit test
* host is a string
* update test assumption
* drop SharedPluginLoaderObj, pre-create a set, instead of 2 comparisons in the list comprehension
* Dedupe code
* Change to _hosts and _hosts_all in get_vars
* Add backwards compat for strategies that don't do set host caches
* Add deprecation message to SharedPluginLoaderObj
* Remove unused SharedPluginLoaderObj import
* Update docs/comments
* Remove debugging
* Indicate what patterh_hash is
* That won't work
* Re-fix tests
* Update _set_hosts_cache to accept the play directly, use without refresh in get_hosts_remaining and get_failed_hosts for backwards compat
* Rename variable to avoid confusion
* On add_host only manipulate _hosts_cache_all
* Add warning docs around _hosts and _hosts_all args
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