SysLogAppender: header elements should be limited in length

[mkucmpro]

According to RFC 5424 the header fields should have length limit:

      HOSTNAME        = NILVALUE / 1*255PRINTUSASCII

      APP-NAME        = NILVALUE / 1*48PRINTUSASCII
      PROCID          = NILVALUE / 1*128PRINTUSASCII
      MSGID           = NILVALUE / 1*32PRINTUSASCII

So, this section of code should probably limit the lengths of the strings passed:

log4cplus/src/syslogappender.cxx

Lines 443 to 450 in d9521ad

	// HOSTNAME
	<< LOG4CPLUS_TEXT (' ') << hostname
	// APP-NAME
	<< LOG4CPLUS_TEXT (' ') << ident
	// PROCID
	<< LOG4CPLUS_TEXT (' ') << internal::get_process_id ()
	// MSGID
	<< LOG4CPLUS_TEXT (' ') << event.getLoggerName ()