fix fabric8io#3865: using just a single builder

doc/MIGRATION-v6.md

@@ -59,7 +59,16 @@ This release introduces kubernetes-client-api and openshift-client-api modules.
 
 If you are directly relying on classes in the -client jars other than DefaultKubernetesClient and DefaultOpenShiftClient, please let us know your usage scenario.  Moving forward we'd like consider all classes in the -client jars internal.
 
-When you rely solely on a compile dependency to the respective -api dependencies you will not be able to use DefaultKubernetesClient nor DefaultOpenShiftClient directly to create your client instances.  You should instead - TBD 
+When you rely solely on a compile dependency to the respective -api dependencies you will not be able to use DefaultKubernetesClient nor DefaultOpenShiftClient directly to create your client instances.  You should instead use KubernetesClientBuilder.  Passing a configuration of HttpClient is instead done through builder methods - withConfig and withHttpClientFactory.  For example:
+
+  ```java
+  KubernetesClient client = new KubernetesClientBuilder().build();
+  ...  
+  ```
+  ```java
+  OpenShiftClient openShiftClient = new new KubernetesClientBuilder().withConfig(new OpenShiftConfigBuilder()...build()).build().adapt(OpenShiftClient.class);
+  ...
+  ```
 
 ### OkHttp HttpClient
 
@@ -87,6 +96,7 @@ The group on the object being deserialized is not required to match the prospect
 - Removed HttpClientUtils.createHttpClient(final Config config, final Consumer<OkHttpClient.Builder> additionalConfig), please use the OkHttpClientFactory instead
 - Removed methods on SharedInformerFactory dealing with the OperationContext
 - Removed DefaultKubernetesClient and DefaultOpenShiftClient constructors directly referencing OkHttp - use OkHttpClientImpl to wrap the OkHttpClient, or the OkHttpClientFactory instead.
+- Removed OpenShiftConfig OpenshiftApiGroupsEnabled methods
 
 ### Extension Development
 
@@ -163,6 +173,7 @@ Client.isAdaptable and Client.adapt will check first if the existing instance is
 ## Deprecations
 
 - ApiVersionUtil classes in each extension have been deprecated, you should use io.fabric8.kubernetes.client.utils.ApiVersionUtil instead.
+- HttpClientUtils.createHttpClient has been deprecated, you should create your own client factory instead.
 
 - Extension specific EnableXXXMockClient and XXXMockServer classes have been deprecated.  You can simply use EnableKubernetesMockClient and KubernetesMockServer instead. Dependencies on the xxx-mock jar are then no longer needed, just a dependency to kubernetes-server-mock.