Add complete test integration

tests/README.md

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+# k8s-integration-tests
+
+*Work In Progress*
+
+## Test environment variables
+
+### Common
+
+Variable              | Description                            | Required   | Default
+--------------------- | -------------------------------------- | ---------- | --------
+`TEST_ID`             | A unique execution ID for this test    | Yes        |
+`KUBE_NETWORK_PLUGIN` | The network plugin (calico or flannel) | Yes        |
+`PRIVATE_KEY_FILE`    | The path to the SSH private key file   | No         |
+
+### AWS Tests
+
+Variable              | Description                                     | Required   | Default
+--------------------- | ----------------------------------------------- | ---------- | ---------
+`AWS_ACCESS_KEY`      | The Amazon Access Key ID                        | Yes        |
+`AWS_SECRET_KEY`      | The Amazon Secret Access Key                    | Yes        |
+`AWS_AMI_ID`          | The AMI ID to deploy                            | Yes        |
+`AWS_KEY_PAIR_NAME`   | The name of the EC2 key pair to use             | Yes        |
+`AWS_SECURITY_GROUP`  | The EC2 Security Group to use                   | No         | default
+`AWS_REGION`          | The EC2 region                                  | No         | eu-central-1
+
+#### Use private ssh key
+
+##### Key
+
+```bash
+openssl pkcs12 -in gce-secure.p12 -passin pass:notasecret -nodes -nocerts | openssl rsa -out gce-secure.pem
+cat gce-secure.pem |base64 -w0 > GCE_PEM_FILE`
+```