At the moment, if poll-instance of osb create operation fails SM will automatically delete the service-instance from its DB.
But, In some cases it is useful that the service-instance will remain in SM DB.
Approach
Add a ctx param key, "PreserveInstanceKey", that indicate the osb_store_plugin to ignore the service-instance creation failure and to keep it in SM DB
Motivation
At the moment, if poll-instance of osb create operation fails SM will automatically delete the service-instance from its DB. But, In some cases it is useful that the service-instance will remain in SM DB.
Approach
Add a ctx param key, "PreserveInstanceKey", that indicate the osb_store_plugin to ignore the service-instance creation failure and to keep it in SM DB