Ticket 47670 - Aci warnings in error log

Bug Description:  Some aci warnings are unneccesarily written to the
                  error log.

Fix Description:  Lower the log messaages from SLAPI_LOG_FATAL to SLAPI_LOG_ACL

Patch provided by: chatfield(Thanks!)

https://fedorahosted.org/389/ticket/47670

Reviewed by: nhosoi(Thanks!)

(cherry picked from commit 4f14e7df8215e30d6dd1205638886a877f46a70c)