added tagging and access tags support for is_snapshot

[SunithaGudisagarIBM]

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Please find the testing results in PR ibm-vpc#43

make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISSnapshot_basic'

resource "ibm_is_snapshot" "testacc_snapshot" {
  name          = "sunitha-snapshot"
  source_volume = "r006-159e42ba-cff8-4448-965b-e618c12e9a4c"
  access_tags   = ["tfp:ussouth", "tfp:eude"]
}

data "ibm_is_snapshot" "ds_snapshot" {
  depends_on = [ibm_is_snapshot.testacc_snapshot]
  name       = "sunitha-snapshot"
}

data "ibm_is_snapshots" "ds_snapshot" {
  depends_on = [ibm_is_snapshot.testacc_snapshot]
  name = "sunitha-snapshot"
}