Patch review for adding command line macro definitions to varnishtest

[Martin Blix Grydeland]

Please find a patch for allowing command line option macro definitions to
varnishtest, which could then be used to replace text in the test scripts.
The syntax is '-D name=value', which would then expand ${name} into value
when executing the test script. The specific use case for adding this is to
have the ability to pass the build directory of the .so library for a
varnish mod to varnishtest when building modules out-of-tree.

-- 
Martin Blix Grydeland
Varnish Software AS
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