Fix possible PHP fatal in services_client_error, make sure errors are retried at least required number

Issue #1964376 by Nick_vh: Fixed Move the services_client_data() alter hook higher so we can alter the visited array.

Issue #1728992 by mhrabovcin | 7wonders: Fixed Broken REST requests when creating CRUD request via REST plugin.

Issue #1948274 by mhrabovcin: Added support to Services Client Connection module for raw HTTP REST requests.

Issue #1939636 by cpliakas: Fixed Notice and warning errors thrown in services_client_data_process() when  is not initialized .

Issue #1661080 by mhrabovcin | kasalla: Fixed Missing auth plugin definition throw PHP exception in services_client_connectin_get().

Unique key instead of key and do not have two exception.inc files as that breaks the autoloading system