Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/google.golang.org/cloud/CONTRIBUTING.md

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+# Contributing
+
+1. Sign one of the contributor license agreements below.
+1. `go get golang.org/x/review/git-codereview` to install the code reviewing tool.
+1. Get the cloud package by running `go get -d google.golang.org/cloud`.
+    1. If you have already checked out the source, make sure that the remote git
+       origin is https://code.googlesource.com/gocloud:
+
+            git remote set-url origin https://code.googlesource.com/gocloud
+1. Make changes and create a change by running `git codereview change <name>`,
+provide a command message, and use `git codereview mail` to create a Gerrit CL.
+1. Keep amending to the change and mail as your recieve feedback.
+
+## Integration Tests
+
+Additional to the unit tests, you may run the integration test suite.
+
+To run the integrations tests, creating and configuration of a project in the
+Google Developers Console is required. Once you create a project, set the
+following environment variables to be able to run the against the actual APIs.
+
+- **GCLOUD_TESTS_GOLANG_PROJECT_ID**: Developers Console project's ID (e.g. bamboo-shift-455)
+- **GCLOUD_TESTS_GOLANG_KEY**: The path to the JSON key file.
+
+Create a storage bucket with the same name as the project id set in **GCLOUD_TESTS_GOLANG_PROJECT_ID**.
+The storage integration test will create and delete some objects in this bucket.
+
+Install the [gcloud command-line tool][gcloudcli] to your machine and use it
+to create the indexes used in the datastore integration tests with indexes
+found in `datastore/testdata/index.yaml`:
+
+From the project's root directory:
+
+``` sh
+# Install the app component
+$ gcloud components update app
+
+# Set the default project in your env
+$ gcloud config set project $GCLOUD_TESTS_GOLANG_PROJECT_ID
+
+# Authenticate the gcloud tool with your account
+$ gcloud auth login
+
+# Create the indexes
+$ gcloud preview datastore create-indexes datastore/testdata/index.yaml
+
+```
+
+You can run the integration tests by running:
+
+``` sh
+$ go test -v -tags=integration google.golang.org/cloud/...
+```
+
+## Contributor License Agreements
+
+Before we can accept your pull requests you'll need to sign a Contributor
+License Agreement (CLA):
+
+- **If you are an individual writing original source code** and **you own the
+- intellectual property**, then you'll need to sign an [individual CLA][indvcla].
+- **If you work for a company that wants to allow you to contribute your work**,
+then you'll need to sign a [corporate CLA][corpcla].
+
+You can sign these electronically (just scroll to the bottom). After that,
+we'll be able to accept your pull requests.
+
+## Contributor Code of Conduct
+
+As contributors and maintainers of this project,
+and in the interest of fostering an open and welcoming community,
+we pledge to respect all people who contribute through reporting issues,
+posting feature requests, updating documentation,
+submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project
+a harassment-free experience for everyone,
+regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information,
+such as physical or electronic
+addresses, without explicit permission
+* Other unethical or unprofessional conduct.
+
+Project maintainers have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct.
+By adopting this Code of Conduct,
+project maintainers commit themselves to fairly and consistently
+applying these principles to every aspect of managing this project.
+Project maintainers who do not follow or enforce the Code of Conduct
+may be permanently removed from the project team.
+
+This code of conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported by opening an issue
+or contacting one or more of the project maintainers.
+
+This Code of Conduct is adapted from the [Contributor Covenant](http://contributor-covenant.org), version 1.2.0,
+available at [http://contributor-covenant.org/version/1/2/0/](http://contributor-covenant.org/version/1/2/0/)
+
+[gcloudcli]: https://developers.google.com/cloud/sdk/gcloud/
+[indvcla]: https://developers.google.com/open-source/cla/individual
+[corpcla]: https://developers.google.com/open-source/cla/corporate