Move the "simple" director into cache_backend.c, since it is what
is really dealing with backends now that directors are objectified.

Make a lot of stuff static as a result.

Collect both the init and fini VRT functins for directors in
cache_backend_cfg.c



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methods in they subservient directors rather than fondle backends directly.



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Unify the call to initialize a director, fan it out in the VRT code.



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The documentation referred to deprecated url.purge, make it point to
purge.url instead.  Maybe it should be updated to the new purge
syntax.

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can trust the result to exist.



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stuff for simple directors.



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Fixes #600

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Fixes #547



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Fixes #591



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This gives us backtraces on panic on when you're not using GCC.

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This was originally a quick hack to allow purging to take the Host:
header into account.

We have a much better and precisely expressive purge syntax now, so
this hack can die.



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Print out how long the testing took and which test took the longest.



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Make the varnish accept address just use a random free TCP port.

Fix a couple of tests where we need to know the port number.



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address(es)



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the hardcoded server port here also



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in VCL snippets.



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parse.



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explicitly specified, and use macros to pick up the result
as necessary.



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and make the listen address explicit where we depend on it, rather
than rely on the default port to be 9080.



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the vcl based on same.  This allows the port to be specified as
zero rather than a hardcoded number.



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refer to things like servers ip/port rather than hardcode it.




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