feat: add compatibility with dep

This commit adds the compatibility with dep (Go dependency
management tool) via symlink creation (same method applied
in kubernetes-csi/csi-test)

Signed-off-by: Alex Szakaly <alex.szakaly@gmail.com>

Author: alex1989hu

v2/README.md

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+This directory mirrors the source code via symlinks.
+This makes it possible to vendor v2.x releases of
+external-attacher with `dep` versions that do not
+support semantic imports. Support for that is currently
+[pending in dep](https://github.com/golang/dep/pull/1963).
+
+If users of dep have enabled pruning, they must disable if
+for external-attacher in their Gopk.toml, like this:
+
+```toml
+[prune]
+  go-tests = true
+  unused-packages = true
+
+  [[prune.project]]
+    name = "github.com/kubernetes-csi/external-attacher"
+    unused-packages = false
+```

v2/cmd/csi-attacher/main.go

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+../../../cmd/csi-attacher/main.go

v2/pkg/attacher/attacher.go

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+../../../pkg/attacher/attacher.go

v2/pkg/attacher/attacher_test.go

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+../../../pkg/attacher/attacher_test.go

v2/pkg/attacher/lister.go

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+../../../pkg/attacher/lister.go

v2/pkg/controller/controller.go

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+../../../pkg/controller/controller.go

v2/pkg/controller/controller_test.go

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+../../../pkg/controller/controller_test.go

v2/pkg/controller/csi_handler.go

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+../../../pkg/controller/csi_handler.go

v2/pkg/controller/csi_handler_test.go

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+../../../pkg/controller/csi_handler_test.go

v2/pkg/controller/framework_test.go

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+../../../pkg/controller/framework_test.go

v2/pkg/controller/trivial_handler.go

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+../../../pkg/controller/trivial_handler.go

v2/pkg/controller/trivial_handler_test.go

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+../../../pkg/controller/trivial_handler_test.go

v2/pkg/controller/util.go

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+../../../pkg/controller/util.go

v2/pkg/controller/util_test.go

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+../../../pkg/controller/util_test.go