Add GRS attributes to pi volume group data sources and related

[Alexander-Kita]

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Relates OR Closes #0000

Output from acceptance testing:

pi_volume_group (d):

=== RUN   TestAccIBMPIVolumeGroupDataSource_basic
--- PASS: TestAccIBMPIVolumeGroupDataSource_basic (10.44s)
PASS

pi_volume_groups (d):

=== RUN   TestAccIBMPIVolumeGroupsDataSource_basic
--- PASS: TestAccIBMPIVolumeGroupsDataSource_basic (13.01s)
PASS

pi_volume_group_details (d):

=== RUN   TestAccIBMPIVolumeGroupDetailsDataSource_basic
--- PASS: TestAccIBMPIVolumeGroupDetailsDataSource_basic (8.56s)
PASS

pi_volume_groups_details (d):

=== RUN   TestAccIBMPIVolumeGroupsDetailsDataSource_basic
--- PASS: TestAccIBMPIVolumeGroupsDetailsDataSource_basic (15.04s)
PASS

pi_volume_group (r):

=== RUN   TestAccIBMPIVolumeGroupUpdate
--- PASS: TestAccIBMPIVolumeGroupUpdate (355.05s)
PASS

Description:

• Adds attributes storage_pool, replication_sites, and auxiliary as attributes to pi_volume_group, pi_volume_groups, pi_volume_group_details, and pi_volume_groups_details data sources.

• Adds replication_sites to pi_volume_group resource

• Adds status_description_errors attribute into schema (missing previously)

[Alexander-Kita]

@hkantare @yussufsh Please review as part of power Q3 release.