[D] Add datacenter capability details.

[michaelkad]

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Relates OR Closes #0000

Output from acceptance testing:

=== RUN   TestAccIBMPIDatacentersDataSourceBasic
--- PASS: TestAccIBMPIDatacentersDataSourceBasic (10.88s)
PASS

=== RUN   TestAccIBMPIDatacenterDataSourceBasic
--- PASS: TestAccIBMPIDatacenterDataSourceBasic (7.28s)
PASS

[ismirlia]

Could you also add or update the datacenter terraform test to make sure those new fields are populated correctly? I don't know if you got a chance run the data source manually and see what that ends up looking like.

[ismirlia]

Opened IBM-Cloud#5666, closing this one.