Added support for defined_performance changes in is_volume

[uibm]

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Relates OR Closes #0000

Output from acceptance testing:

Changes in datasource :

• ibm_is_volume
  • code
  • test
  • doc

=== RUN   TestAccIBMISVolumeDatasource_Sdp
--- PASS: TestAccIBMISVolumeDatasource_Sdp (56.36s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     57.975s

• ibm_is_volume_profile
  • code
  • test
  • doc

=== RUN   TestAccIBMISVolumeProfileDataSource_sdpbasic
--- PASS: TestAccIBMISVolumeProfileDataSource_sdpbasic (20.01s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     21.625s

• ibm_is_volume_profiles
  • code
  • test
  • doc

=== RUN   TestAccIBMISVolumeProfilesDataSource_Sdp
--- PASS: TestAccIBMISVolumeProfilesDataSource_Sdp (21.71s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     23.689s

• ibm_is_volumes
  • code
  • test
  • doc

=== RUN   TestAccIBMIsVolumesDataSourceSdpBasic
--- PASS: TestAccIBMIsVolumesDataSourceSdpBasic (24.26s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     26.330s

Changes in resource :

• ibm_is_instance_volume_attachment
  • code
  • test
  • doc

--- PASS: TestAccIBMISInstanceVolumeAttachment_sdpbasic (402.06s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     404.464s

• ibm_is_instance
  • code
  • test
  • doc

=== RUN   TestAccIBMISInstance_sdpbasic
--- PASS: TestAccIBMISInstance_sdpbasic (280.03s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     281.689s

• ibm_is_volume
  • code
  • test
  • doc

=== RUN   TestAccIBMISVolume_sdpUpdate
--- PASS: TestAccIBMISVolume_sdpUpdate (163.70s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     165.720s

=== RUN   TestAccIBMISVolume_sdp
--- PASS: TestAccIBMISVolume_sdp (103.81s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     105.876s