[PATCH] support for multiple -o arguments to varnish tools

[Tollef Fog Heen]

The following patch allows multiple -o arguments to varnishlog,
varnishncsa, varnishhist and varnishsizes.  The format is -o tag:regex
which will only count a transaction if it matches all the -o
parameters.

Feedback is most welcome, in particular I wonder if -o is a good choice
or if we should go with -m(atch) or somtheing similar.  -o is also
somewhat confusing since some people think it means -o(r)

Comments on the implementation is welcome too, of course.

Regards,

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Tollef Fog Heen
Varnish Software
t: +47 21 98 92 64