(DUX) Bug: Fixed the Terraform create DB with non-existing region

[pushpalathaeg]

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Relates OR Closes #0000

Issue: https://github.ibm.com/compose/App/issues/2087

Before the Fix

Proposed changes:
Terraform plan will check the valid regions and give the validation errors instead of panic errors before TF apply

After the Fix

Output from acceptance testing:

$ make testacc TEST=./ibm/service/database TESTARGS='-run=TestAccIBMDatabaseInstancePostgresBasic'
=== RUN   TestAccIBMDatabaseInstancePostgresBasic
=== PAUSE TestAccIBMDatabaseInstancePostgresBasic
=== CONT  TestAccIBMDatabaseInstancePostgresBasic
--- PASS: TestAccIBMDatabaseInstancePostgresBasic (1157.09s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/database        1158.496s


...

[hkantare]

This fix can't be taken since provider is common for all IBM cloud services, we can't restrict the region check at provider level