[Resource] [Datasource] Power add VSN functionality to datasources an…

[Alexander-Kita]

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Relates OR Closes #0000

Output from acceptance testing:

pi_virtual_serial_number (d):

=== RUN   TestAccIBMPIVirtualSerialNumber
--- PASS: TestAccIBMPIVirtualSerialNumber (29.53s)
PASS

pi_virtual_serial_numbers (d):

=== RUN   TestAccIBMPIVirtualSerialNumbers
--- PASS: TestAccIBMPIVirtualSerialNumbers (27.74s)
PASS

pi_virtual_serial_number (r)

=== RUN   TestAccIBMPIVirtualSerialNumberBasic
--- PASS: TestAccIBMPIVirtualSerialNumberBasic (44.18s)
PASS

=== RUN   TestAccIBMPIVirtualSerialNumberWithInstance
--- PASS: TestAccIBMPIVirtualSerialNumberWithInstance (310.44s)
PASS

pi_instance (d)

=== RUN   TestAccIBMPIInstanceDataSource_basic
--- PASS: TestAccIBMPIInstanceDataSource_basic (44.95s)
PASS

pi_instances (d)

=== RUN   TestAccIBMPIInstancesDataSource_basic
--- PASS: TestAccIBMPIInstancesDataSource_basic (22.78s)
PASS

pi_instance (r)

=== RUN   TestAccIBMPIInstanceBasic
--- PASS: TestAccIBMPIInstanceBasic (998.46s)
PASS

=== RUN   TestAccIBMPIInstanceVirtualSerialNumber
--- PASS: TestAccIBMPIInstanceVirtualSerialNumber (413.08s)
PASS