Replace Get-FileHash with MD5 code that works on PowerShell 3.

* moved common code to an module_util snippet
* rewrote logic to make each module idempotent
* added new capabilities like the write_config option

Don't use ternary if statements. Fixes #8784

Fixes #8799

Fix typo: `active` -> `activate`

Also updates the version_added and other references to the version
in which the connection draining functionality was added.

Redo of original patch, which adds an additional check to ensure the
known_hosts file isn't trampled when host_key_checking is disabled.

Fixes #8169

Fixes #8278

Merge branch 'feature/makes-ec2-lc-boto-iso-functional' of https://github.com/botify-labs/ansible into botify-labs-feature/makes-ec2-lc-boto-iso-functional

ansible-vault: The correct option is password_file. Fixes #8752

Also minor fixes like adjusting version_added fields, etc.

Also fixes missing doc fragments missing in template and assemble