2efc41c CACHE_REQ: Add cache_req_data_get_type()

Authored and Committed by jhrozek 5 years ago
    CACHE_REQ: Add cache_req_data_get_type()
    
    Adds a utility function which returns the lookup type stored in struct
    cache_req_data. This will be used later to switch between different
    lookups as appropriate.
    
    Related:
    https://pagure.io/SSSD/sssd/issue/3822
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>