Wrong content-type from director REST API responses

[poblin-orange]

see issue https://github.com/cloudfoundry/bosh/issues/1290 possible workaround for client side patching :

• http://www.baeldung.com/spring-httpmessageconverter-rest
• http://stackoverflow.com/questions/26761845/in-spring-boot-adding-a-custom-converter-by-extending-mappingjackson2httpmessag
• http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-customize-the-jackson-objectmapper

[poblin-orange]

patch applied, overide director response content-type with Ok Http Interceptor