res_sorcery_realtime.c: Fix unqualified fetch warning.

The allow_unqualified_fetch option for the sorcery realtime backend
blocked actually fetching all rows when the option is set to warn.

* Made issue a warning and actually do the request when
allow_unqualified_fetch=warn is set.

Change-Id: I74456c80a03a62dce66fc3dc3cb0cf2351ac4312