Connection wizard: Switch from OpenShift 3 server type to OpenShift 2 triggers usage of default server

In a New Connection dialog if OpenShift 3 server type is selected and there is no server URL then switch to OpenShift 2 server type checks (enables) the Use default Server checkbox. We should have consistent behavior in switching between OpenShift 2 and OpenShift 3. Because if there is a server URL for OpenShift X server type and I switch to OpenShift Y server type, the URL value persists and checkbox is not being checked.

We should not check the Use default Server check box upon switching from OpenShift 3 to OpenShift 2 server type with empty URL.