Are you submitting this PR against the develop branch?

Yes

What is this change about?

Allow windows stack to be configured to something other than windows

Please provide contextual information.

This will allow other users who support custom stacks to use this suite. This change is backward compatible and will default to windows

What version of cf-deployment have you run this cf-acceptance-test change against?

Develop

Please check all that apply for this PR:

• introduces a new test --- Are you sure everyone should be running this test?
• changes an existing test
• requires an update to a CATs integration-config

Did you update the README as appropriate for this change?

• YES
• N/A

If you are introducing a new acceptance test, what is your rationale for including it CATs rather than your own acceptance test suite?

N/A

How many more (or fewer) seconds of runtime will this change introduce to CATs?

None

What is the level of urgency for publishing this change?

• Urgent - unblocks current or future work
• Slightly Less than Urgent

Tag your pair, your PM, and/or team!