Make sure tls-events is part of the dist

Added it to Makefile.am so it will be part of the dist created by
make distcheck.
pcap/afpacket: update counters at exit

In really short Suricata runtimes the capture counters would not
be updated. This patch does a force update at the end of the
capture loops in pcap and af-packet.
configure: fix typo in libjansson warning message
htp: don't assume HTPCallbackRequestLine is the first callback

By assuming that HTPCallbackRequestLine would always be run first,
an memory leak was introduced. It would not check if user data already
existed in the tx, causing it to overwrite the user data pointer is
it already existed.

Bug #1092.