Ticket 49072 - fix log refactoring(part 2)
Description: change slapi_log_err() to slapi_log_error()
https://fedorahosted.org/389/ticket/49072
Reviewed by: mreynolds(one line commit rule)
(cherry picked from commit 262f095f1b97a71b695d334bdd80ce35f11c4d07)