Remove validation on GCF regions (#3530)
Remove validation on GCF regions (#3530)

* adding additional GCF regions supported 

Fixes https://github.com/terraform-providers/terraform-provider-google/issues/3515 
https://cloud.google.com/functions/docs/locations

* remove region validation from google cloud functions

* remove for region check resource creation

hashicorp/terraform-provider-google,hashicorp/terraform-provider-google,ubschmidt2/terraform-provider-google,terraform-providers/terraform-provider-google,terraform-providers/terraform-provider-google,ubschmidt2/terraform-provider-google,terraform-providers/terraform-provider-google,terraform-providers/terraform-provider-google,ubschmidt2/terraform-provider-google,terraform-providers/terraform-provider-google,hashicorp/terraform-provider-google,hashicorp/terraform-provider-google,ubschmidt2/terraform-provider-google