vol fix for snapshot crn

[ujjwal-ibm]

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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 (254.98s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     257.024s

[SunithaGudisagarIBM1]

resource ibm_is_volume this {
  name = "test-terraform-100"
  profile = "general-purpose"
  zone    = "us-south-2"
  source_snapshot_crn = "crn:v1:bluemix:public:is:us-south:a/7f75c7b025e54bc5635f754b2f888665::snapshot:r006-020efb8d-001a-43c6-95c3-73c7d7f4da0d"
}

resource ibm_is_volume this1 {
  name = "test-terraform-1002"
  profile = "general-purpose"
  zone    = "us-south-2"
  source_snapshot = "r006-020efb8d-001a-43c6-95c3-73c7d7f4da0d"
}

[SunithaGudisagarIBM1]