* Refactoring the peering integ test to accommodate coming changes of other upgrade scenarios.
- Add a utils package under test that contains methods to set up various test scenarios.
- Deduplication: have a single CreatingPeeringClusterAndSetup replace
CreatingAcceptingClusterAndSetup and CreateDialingClusterAndSetup.
- Separate peering cluster creation and server registration.
* Apply suggestions from code review
Co-authored-by: Dan Stough <dan.stough@hashicorp.com>
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