v3(fix): fix failing unit test

[#173129426](https://www.pivotaltracker.com/story/show/173129426)

Author: Derik Evangelista

spec/request/service_credential_bindings_spec.rb

@@ -180,7 +180,7 @@ def expected_json(binding)
       guid: binding.guid,
       created_at: iso8601,
       updated_at: iso8601,
-      name: binding.name,
+      name: binding.name || binding.service_instance.name,
       last_operation: nil,
       relationships: {
         service_instance: {