Switch to github.com/golang/dep for vendoring

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

vendor/k8s.io/kubernetes/docs/reporting-security-issues.md

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+# Security
+
+If you believe you have discovered a vulnerability or have a security incident to report, please follow the steps below. This applies to Kubernetes releases v1.0 or later.
+
+To watch for security and major API announcements, please join our [kubernetes-announce](https://groups.google.com/forum/#!forum/kubernetes-announce) group.
+
+## Reporting a security issue
+
+To report an issue, please:
+- Submit a bug report [here](http://goo.gl/vulnz).
+  - Select “I want to report a technical security bug in a Google product (SQLi, XSS, etc.).”
+  - Select “Other” as the Application Type.
+- Under reproduction steps, please additionally include
+  - the words "Kubernetes Security issue"
+  - Description of the issue
+  - Kubernetes release (e.g. output of `kubectl version` command, which includes server version.)
+  - Environment setup (e.g.  which "Getting Started Guide" you followed, if any; what node operating system used; what service or software creates your virtual machines, if any)
+
+An online submission will have the fastest response; however, if you prefer email, please send mail to security@google.com. If you feel the need, please use the [PGP public key](https://services.google.com/corporate/publickey.txt) to encrypt communications.
+
+
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