[terraform-ibm-base-ocp-vpc] More coverage required for upgrade test

[ocofaigh]

I very much disagree with this ->

terraform-ibm-base-ocp-vpc/tests/pr_test.go

Line 165 in bdbab68

// Upgrade Test does not require KMS encryption

The upgrade test should opt into ALL features so backward compatibility tests are done with as much test coverage as possible.