[JENKINS-67664] Adapt to kubernetes-client changes

InterruptedException is no longer thrown on websocket timeout, rather a
KubernetesClientException. Unfortunately there is no way to
differentiate between a timeout and an error.

* fabric8io/kubernetes-client#3274
* fabric8io/kubernetes-client#3197

Author: Vlatombe

src/main/java/org/csanchez/jenkins/plugins/kubernetes/pipeline/ContainerExecDecorator.java

@@ -45,7 +45,6 @@
 
 import hudson.AbortException;
 import io.fabric8.kubernetes.api.model.Container;
-import org.apache.commons.io.output.NullOutputStream;
 import org.apache.commons.io.output.TeeOutputStream;
 import org.csanchez.jenkins.plugins.kubernetes.ContainerTemplate;
 import org.csanchez.jenkins.plugins.kubernetes.KubernetesSlave;
@@ -64,7 +63,6 @@
 import io.fabric8.kubernetes.client.dsl.ExecListener;
 import io.fabric8.kubernetes.client.dsl.ExecWatch;
 import io.fabric8.kubernetes.client.dsl.Execable;
-import okhttp3.Response;
 
 import static org.csanchez.jenkins.plugins.kubernetes.pipeline.Constants.EXIT;
 
@@ -427,19 +425,10 @@ public void onClose(int i, String s) {
                 try {
                     watch = execable.exec(sh);
                 } catch (KubernetesClientException e) {
-                    if (e.getCause() instanceof InterruptedException) {
-                        throw new IOException(
-                                "Interrupted while starting websocket connection, you should increase the Max connections to Kubernetes API",
-                                e);
-                    } else {
-                        throw e;
-                    }
-                } catch (RejectedExecutionException e) {
-                    throw new IOException(
-                            "Connection was rejected, you should increase the Max connections to Kubernetes API", e);
+                    throw new IOException("Unable to perform kubernetes execution, you should consider increasing the Max connections to Kubernetes API", e);
                 }
 
-                boolean hasStarted = false;
+                boolean hasStarted;
                 try {
                     // prevent a wait forever if the connection is closed as the listener would never be called
                     hasStarted = started.await(WEBSOCKET_CONNECTION_TIMEOUT, TimeUnit.SECONDS);