conformance testing for gravity 5.6 (cncf#575)

v1.14/gravity/PRODUCT.yaml

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+vendor: Gravitational
+name: Gravity
+version: 5.6.1
+website_url: https://gravitational.com/gravity
+documentation_url: https://gravitational.com/gravity/docs/overview/
+product_logo_url: https://gravitational.com/gravity/docs/img/logo.svg
+type: distribution
+description: Gravity is a Kubernetes packaging solution that takes the drama out of on-prem deployments.

v1.14/gravity/README.md

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+# Running conformance tests against Gravity
+
+Get a node or VM which meets the following requirements: https://gravitational.com/telekube/docs/requirements/
+
+
+Get Gravity
+```console
+$ curl https://get.gravitational.io/telekube/install | bash
+$ tele pull telekube:5.6.1
+$ tar -xvf telekube-5.6.1.tar
+```
+
+Install Gravity
+```console
+$ sudo ./gravity install
+```
+
+Enter the gravity container, which holds our kubernetes installation
+```console
+$ sudo gravity enter
+```
+
+Delete all the jobs used during installation so they don't conflict with the testing
+```console
+18:55:16 root@cncf-conformance-1:/# kubectl get jobs --all-namespaces | awk '{ print $2, "--namespace", $1 }' | while read line; do kubectl delete jobs $line; done
+```
+
+sonobuoy currently require privileged containers
+https://github.com/heptio/sonobuoy/issues/559
+```console
+18:55:16 root@cncf-conformance-1:/# sed -i 's/allow-privileged=false/allow-privileged=true/g' /lib/systemd/system/kube-*
+18:55:16 root@cncf-conformance-1:/# systemctl daemon-reload
+18:55:16 root@cncf-conformance-1:/# systemctl restart 'kube-*'
+```
+
+
+Run the conformance tests
+```
+gravity-conformance-2:/$ curl -L https://github.com/heptio/sonobuoy/releases/download/v0.14.2/sonobuoy_0.14.2_linux_amd64.tar.gz -o sonobuoy.tar.gz
+gravity-conformance-2:/$ tar -zxvf sonobuoy.tar.gz
+gravity-conformance-2:/$ ./sonobuoy run
+```