Reverts change in API for Configurator by properly @Depracating removed method

Configurator.getThirdpartyJaxRsClasses was removed while being a public method,
 leading to breakage of users of that method, which included the
 authentication-extension. That method is now reintroduced, with
 a @Depracated warning.
Merge pull request #1015 from digitalstain/1.9-maint

Reverts change in API for Configurator by properly @Depracating removed method