cache_req: add support for UPN Reviewed-by: Sumit Bose <sbose@redhat.com>

test common: sss_dp_get_account_recv() fix assignment Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

RESPONDERS: Add a new request sss_parse_inp_send The responders were copying code to parse input and on encountering an uknown domain, send the discover subdomain request. This patch adds a reusable request that can always be called in responders and in case the name can be parsed, just shortcut. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

TESTS: Split a separate common_mock_resp_dp module Splitting the module would allow responders that test the Data Provider requests to use the mock_rctx/mock_cctx functions without duplicate definitions. Reviewed-by: Pavel Březina <pbrezina@redhat.com>