Remove incorrect changelog entry.

After re-reading the patch, this isn't important enough to
warrant a changelog entry.

Spotted by: 	fgsch
Update copyright statement.
Unhide vcl.show from 'help' output, it was hidden due to overzealous
copy&paste.

Spotted by:	scn
varnishlog -k argument

Implement -k argument in vut for use with varnishlog. This takes as an
argument the number of log transactions to be processed before
exiting. Useful to stop varnishlog after a given set of log data has
been produced.

Drop -s from the 'not implemented yet' list as this option has very
limited usefullness.
Prepare 4.0.2.