Zookeeper free workload generator

Closes #146 (closed).

Still missing:

• Adapt Theodolite execution Kubernetes resources and Python scripts
• Adapt Docker configurations (to fix #106 (closed))

benchmarks/workload-generator-commons/src/main/java/theodolite/commons/workloadgeneration/ClusterConfig.java

+package theodolite.commons.workloadgeneration;
+
+/**
+ * Configuration of a load generator cluster.
+ */
+public final class ClusterConfig {
+
+  private static final int PORT_DEFAULT = 5701;
+  private static final String CLUSTER_NAME_PREFIX_DEFAULT = "theodolite-load-generation";
+
+  private final String bootstrapServer;
+  private final String kubernetesDnsName;
+  private int port = PORT_DEFAULT;
+  private boolean portAutoIncrement = true;
+  private String clusterNamePrefix = CLUSTER_NAME_PREFIX_DEFAULT;
+
+  /**
+   * Create a new {@link ClusterConfig} with the given parameter values.
+   */
+  private ClusterConfig(final String bootstrapServer, final String kubernetesDnsName) {
+    this.bootstrapServer = bootstrapServer;
+    this.kubernetesDnsName = kubernetesDnsName;
+  }
+
+  public boolean hasBootstrapServer() {
+    return this.bootstrapServer != null;
+  }
+
+  public String getBootstrapServer() {
+    return this.bootstrapServer;
+  }
+
+  public boolean hasKubernetesDnsName() {
+    return this.kubernetesDnsName != null;
+  }
+
+  public String getKubernetesDnsName() {
+    return this.kubernetesDnsName;
+  }
+
+  public int getPort() {
+    return this.port;
+  }
+
+  public boolean isPortAutoIncrement() {
+    return this.portAutoIncrement;
+  }
+
+  public ClusterConfig setPortAutoIncrement(final boolean portAutoIncrement) { // NOPMD
+    this.portAutoIncrement = portAutoIncrement;
+    return this;
+  }
+
+  public ClusterConfig setPort(final int port) { // NOPMD
+    this.port = port;
+    return this;
+  }
+
+  public String getClusterNamePrefix() {
+    return this.clusterNamePrefix;
+  }
+
+  public ClusterConfig setClusterNamePrefix(final String clusterNamePrefix) { // NOPMD
+    this.clusterNamePrefix = clusterNamePrefix;
+    return this;
+  }
+
+  public static ClusterConfig fromBootstrapServer(final String bootstrapServer) {
+    return new ClusterConfig(bootstrapServer, null);
+  }
+
+  public static ClusterConfig fromKubernetesDnsName(final String kubernetesDnsName) {
+    return new ClusterConfig(null, kubernetesDnsName);
+  }
+
+}