Plone.recipe.varnish

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- Use 4.1 version by default (4.0 was default until now). [maurits]

----------------

- When using varnish 4.1, use varnish 4.1.9.
4.0 is still the default. [cleberjsantos, maurits]

- fix default value for ``COOKIE_PASS_DEFAULT`` not matching any other
urls than the intended static resources.
[petschki]

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- New: refactor start script as Jinja2 template
[petschki]

- Fix to failing travis tests, ``bin/createcoverage`` tries to open browser.
[instification]

- Stripped query string before testing which urls to strip cookies on.
https://github.com/collective/plone.recipe.varnish/issues/42 [instification]

- Fix custom vcl code insertion for ``vcl_backend_fetch`` and ``vcl_backend_response``
Update documentation
[petschki]

- Fix parameter for jailed user in ``varnish_version=4.1``
[petschki]

- update documentation for ``varnish_version`` which only makes sense to be set in
the build-part.
[petschki]

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- Changed default downloads to ``.tgz`` instead of ``.tar.gz``.
For some reason they were renamed after the last release of this recipe.
[maurits]

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- Updated default urls to `varnish security releases <https://varnish-cache.org/security/VSV00001.html>`_.
Also updated these urls to not use the ``repo.varnish-cache.org`` domain,
because those links will stop working at `31 August 2017 <https://varnish-cache.org/news/index.html#package-repository-status>`_.
[maurits]

- Fix VCL director: from round-robin to round_robin, tests refactored.
[cleberjsantos]

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- Made three possible values for the ``varnish_version`` option. 4.0
(uses 4.0.3), 4.1 (uses 4.1.3), 4 (uses 4.1.3). 4.0 is the default for now.
4 is intended to be updated to 4.2.x when this is released and found
to work.
[maurits]

- Fix: to disable the secret-file authentication, an empty parameter should be
passed to varnishd on startup.
[fredvd, nutjob4life]