Ticket #48304 - ns-slapd - LOGINFO:Unable to remove file
    
    Description: In the log rotation, if a log file to be deleted does
    not exist, the "Unable to remove file" is logged in the error log,
    which is not necessary.
    
    This patch updates the logging code to suppress the unnecessary log
    messages as well as replace with more detailed ones.
    
    https://fedorahosted.org/389/ticket/48304
    
    Reviewed by mreynolds@redhat.com (Thank you, Mark!!)
    
    (cherry picked from commit e2abffcc5cf6e63136fc0bcb5b0e12830cca22a5)