Rom Gaigi

Results 7 issues of Rom Gaigi

Fixes: [ #118](https://github.com/movetokube/postgres-operator/issues/118)

When the deletion of Postgres CR happens before the deletion of postgresusers CR that linked to the same postgres, it makes the postgresuser cr finalizers to fail, saying it cannot...

Aws has the ability to set iam authentication with RDS. We have added this ability to the operator