Log Message:
Update to 6.1.7.

Changes:
 * added log classification capabilities (via mmnormalize & tags)
 * speeded up tcp forwarding by reducing number of API calls
   this especially speeds up TLS processing
 * somewhat improved documentation index
 * bugfix: enhanced imudp config processing code disabled due to wrong
   merge (affected UDP realtime capabilities)
 * bugfix (kind of): memory leak with tcp reception epoll handler
   This was an extremely unlikely leak and, if it happend, quite small.
   Still it is better to handle this border case.
 * bugfix: IPv6-address could not be specified in omrelp
   this was due to improper parsing of ":"
   closes: http://bugzilla.adiscon.com/show_bug.cgi?id=250