* Remove use of _remote_checksum from fetch module
* Add deprecation message displayed during runtime
* Increase test coverage for fetch
* Add tests covering the use of stat from the fetch module
This required creating an unpriveleged user account and connecting as that user remotely since
it is not possible to create a file that the root user cannot stat.
* Use fact caching to persist remote tmp dir across playbook runs
* Add variables to setup_remote_tmp test role to allow caching of the remote temp dir fact
and preventing removal of the remote_tmp_dir
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