More tests, better handling of list arguments to _split_pattern

Merge branch 'sudo_on_if_needed' of https://github.com/apollo13/ansible into apollo13-sudo_on_if_needed

Python 3: basestring in play_context.py

Fixes #12418

There were no inventory-specific unit tests earlier, so we add a new
directory for them with some initial low-level tests of _split_pattern
with various valid and deprecated pattern strings.

The earlier-recommended "pat1:pat2:pat3[x:y]" notation doesn't work well
with IPv6 addresses, so we recommend ',' as a separator instead. We know
that commas can't occur within a pattern, so we can just split on it.

We still have to accept the "foo:bar" notation because it's so commonly
used, but we issue a deprecation warning for it.

Fixes #12296
Closes #12404
Closes #12329

Documentation for retry_files_enabled and retry_files_save_path

Add a travis test for urlopen usage

Python 3: two more instances of 'basestring'

Enable winrm put_file to upload an empty file.

Add PowerShell exception handling and turn on strict mode.

Fix spelling

Support additional options for WinRM connections via inventory variables

Remove ansible_winrm_ host/port/user/pass options, update exception handling around establishing a winrm connection.

Pass windows command as-is without splitting/rejoining parameters.

* Fixes extra spaces added between parameters from https://github.com/ansible/ansible-modules-core/issues/1929
* Correctly decode PowerShell command encoded as UTF-16-LE so that it displays correctly in debug messages, fixes the other issue from https://github.com/ansible/ansible-modules-core/issues/1929
* Add test to verify that script parameters are passed as-is, so $true is interpreted as a boolean, fixes https://github.com/ansible/ansible/issues/10947

Add integration tests for win_group module.

Add tests for creates parameter to win_msi module.