Merge audit.c:1.28, audit_private.h:1.15, audit_worker.c:1.15 from HEAD to
    RELENG_6:
    
      Remove AUDIT_PRINTF() debugging statements and definition; clean up or
      remove associated comments.
    
      Slip audit_file_rotate_wait assignment in audit_rotate_vnode() before
      the drop of the global audit mutex.
    
      Obtained from:  TrustedBSD Project