made accelerate keys directory configurable, and permissions for the file and dir configurable, and gave them a safe default

Resolves issues with newer versions of pip not having a --use-mirrors paramater for the install command

Do not place (or higher) in min_ansible_version

add var for format.

More don't catch `SystemExit`

Fixes #5159 `file` module: Don't catch `SystemExit`

tests depend on the default encoding being utf8

Fix for issue #4730 - stacktrace when deferenencing a non-existent group

Make sure ssh pipes are empty before moving on

Fix issue #5214: hostname persistence on RedHat/CentOS

Prevents UnicodeEncodeError

Fix checking for existence of EC2 tags

Fixes #5081

Avoid a traceback when using accelerate

fix heading name syntax in AWS guide

This bit of code is attempting to access accelerate_inventory_host,
which may not have been set/created. This will cause a traceback.
Instead use getattr with a fallback to False.

Fixes #5064