Are you submitting this PR against the develop branch?

Yes.

What is this change about?

Use the TCP domain config helper to support users who override the default value.

Please provide contextual information.

If you use a non-standard TCP domain, the app syslog tests fail.

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

Latest.

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?

N/A

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!

It's helpful to tag a few other folks on your team or your team alias in case we need to follow up later.