Switch to github.com/golang/dep for vendoring

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

vendor/github.com/containers/storage/docs/oci-storage-get-image-data.md

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+## oci-storage-get-image-data 1 "August 2016"
+
+## NAME
+oci-storage get-image-data - Retrieve lookaside data for an image
+
+## SYNOPSIS
+**oci-storage** **get-image-data** [*options* [...]] *imageNameOrID* *dataName*
+
+## DESCRIPTION
+Retrieves a piece of named data which is associated with an image.
+
+## OPTIONS
+**-f | --file** *file*
+
+Write the data to a file instead of stdout.
+
+## EXAMPLE
+**oci-storage get-image-data -f manifest.json my-image manifest**
+
+## SEE ALSO
+oci-storage-list-image-data(1)
+oci-storage-set-image-data(1)