Deprecated match_resource_types and Intoduced match_resource_type

[SunithaGudisagarIBM1]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

resource "ibm_is_backup_policy" "is_backup_policy" {
  match_user_tags = ["tag-0"]
  name            = "sunitha-terraform-baas"
}

resource "ibm_is_backup_policy" "is_backup_policy1" {
  match_user_tags = ["tag-0"] 
  match_resource_type = "volume"
  name            = "sunitha-terraform-baas1" 
} 
data "ibm_is_backup_policies" "is_backup_policies" {
}

[hkantare]

Add testcases for new attribute