Changes:
* Replaced large netperfmeter-dccp.pcapng.gz and netperfmeter.pcap.gz captures
by one common small netperfmeter.pcapng.gz for the suites follow_dccp and
netperfmeter.
* Updated test suites "follow_dccp" and "netperfmeter".
This pull request includes:
* The "Follow DCCP stream" feature.
* Updated docbook documentation for the "Follow DCCP stream" feature.
* Test for the feature.
* Corresponding packet trace for the test.