incorporate https://github.com/IBM-Cloud/terraform-provider-ibm/issues/6150

[vburckhardt]

          @Aashiq-J - we should incorporate https://github.com/IBM-Cloud/terraform-provider-ibm/issues/6150 as the fix for customer to solve all issues, including on destroy. there is a workaround on destroy for computed value, using the shell provider instead of null resource block, but this is rather hack-ish so going through the proper fix in provider should work.

Originally posted by @vburckhardt in #652 (comment)

[vburckhardt]

1. test that the fix in provider solve all issues in this area
2. remove the workaround in module
3. point to new version of provider as minimum to incorporate the fix