[#42] Ensure the api-identity service is not set twice
[#42] Ensure the api-identity service is not set twice

- As the second attempt will raise an exception.

stefanotorresi/zf-mvc-auth,eoko/zf-mvc-auth,jonday-mayden/zf-mvc-auth,qapa/zf-mvc-auth,SvenRtbg/zf-mvc-auth