Add a -o option to varnishncsa to allow filtering of output to only request groups which match a regular expression on a given tag.

Add errors on -i and -I options in varnishncsa, as these options does not make sense for that utility.

Add documentation to varnishncsa for -o option, and remove documentation for -i and -I.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5419 d4fa192b-c00b-0410-8231-f00ffab90ce4