support for snapshot crn

[uibm]

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Relates OR Closes #0000

Output from acceptance testing:

% make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISVolume_snapshotcrn'
=== RUN   TestAccIBMISVolume_snapshotcrn
--- PASS: TestAccIBMISVolume_snapshotcrn (230.20s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     233.040s

=== RUN   TestAccIBMISVolume_snapshot
--- PASS: TestAccIBMISVolume_snapshot (272.53s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     275.362s

% make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISInstanceVolumeAttachment_crn'
=== RUN   TestAccIBMISInstanceVolumeAttachment_crn
--- PASS: TestAccIBMISInstanceVolumeAttachment_crn (232.60s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     234.586s

--- PASS: TestAccIBMISInstanceVolumeAttachment_basic (313.05s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     314.604s

--- PASS: TestAccIBMISInstanceSnapshotRestore_crn (312.05s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     313.924s

--- PASS: TestAccIBMISInstanceSnapshotRestore_basic (268.93s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     270.461s

[uibm]

=== RUN   TestAccIBMISInstance_basic
--- PASS: TestAccIBMISInstance_basic (258.65s)

=== RUN   TestAccIBMISInstance_basicwithipv4
--- PASS: TestAccIBMISInstance_basicwithipv4 (142.84s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     403.091s

[uibm]

=== RUN   TestAccIBMISInstance_vni
--- PASS: TestAccIBMISInstance_vni (152.78s)
=== RUN   TestAccIBMISInstance_vni_update
--- PASS: TestAccIBMISInstance_vni_update (231.22s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     385.559s

[uibm]

--- PASS: TestAccIBMISInstance_lifecycle (253.30s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     255.309s

[uibm]

--- PASS: TestAccIBMISInstance_rip (168.81s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     170.382s

[uibm]

--- PASS: TestAccIBMISInstance_ResizeBoot (250.20s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     252.235s
--- PASS: TestAccIBMISInstance_RenameBoot (238.28s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     240.162s