relative imports and duplicate includes

[Kacper Wysocki]

Hi all,

attached is a patch to make 'import foo' relative to the importing source file,
and a patch to remove the error upon duplicate 'include'.

vcl that comes from the cli or f_arg doesn't get a path, but in this
case we fallback to vcl_dir. This means the same behavior for absolute
paths and one-directory deep relative includes under vcl_dir.

Use case: These two patches together make it possible to write and
release a self-contained vcl package which you can include into your
vcl.

PRs are on github fwiw.

0K
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