Follow on to r1755264, for the case of merged header length exceptions,

and ensure the field header name is truncated to a sane log width.

  Stop reflecting irrelevant data to the request error notes, particularly
  for abusive and malformed traffic the non-technical consumer of a user-agent
  has no control over.

  Simply take note where the administrator-configured limits have been exceeded,
  that administrator can find details in the error log if desired.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1755744 13f79535-47bb-0310-9956-ffa450edef68