Merge pull request #3719 from Emc1992/readme-docker-1

Reword docker readme

test/infrastructure/docker/README.md

@@ -2,6 +2,8 @@
 
 CAPD is a reference implementation of an infrastructure provider for the Cluster API project using Docker.
 
+**NOTE:** The Docker provider is **not** designed for production use and is intended for development environments only.
+
 This is one out of three components needed to run a Cluster API management cluster.
 
 For a complete overview, please refer to the documentation available [here](https://github.com/kubernetes-sigs/cluster-api/tree/master/bootstrap/kubeadm#cluster-api-bootstrap-provider-kubeadm) which uses CAPD as an example infrastructure provider.
@@ -12,9 +14,11 @@ For a complete overview, please refer to the documentation available [here](http
 * The code is highly trusted and used in testing of ClusterAPI.
 * This provider can be used as a guide for developers looking to implement their own infrastructure provider.
 
-## End-to-end testing
+## Testing
 
 In order to test your local changes, go to the top level directory of this project, `cluster-api/` and run
-`make -C test/infrastructure/docker test-e2e` to run the test suite.
+`make -C test/infrastructure/docker test` to run the unit tests. 
+
+**Note:** `make test-e2e` runs the CAPI E2E tests that are based on CAPD (CAPD does not have a separated e2e suite).
 
-This make target will build an image based on the local source code and use that image during testing.
+This make target will build an image based on the local source code and use that image during testing.