Pull up executionOrder property into SpecElementInfo

Both SpecInfo and FeatureInfo had identical executionOrder bean
properties, declared redundantly. Therefore, I pulled them up into the
base class.

Relates to #1443.

Author: kriegaex

spock-core/src/main/java/org/spockframework/runtime/model/FeatureInfo.java

@@ -14,7 +14,6 @@
  */
 public class FeatureInfo extends SpecElementInfo<SpecInfo, AnnotatedElement> implements ITestTaggable {
   private int declarationOrder; // per spec class
-  private int executionOrder;   // per spec inheritance chain
 
   private final List<String> parameterNames = new ArrayList<>();
   private final List<String> dataVariables = new ArrayList<>();
@@ -59,14 +58,6 @@ public void setDeclarationOrder(int declarationOrder) {
     this.declarationOrder = declarationOrder;
   }
 
-  public int getExecutionOrder() {
-    return executionOrder;
-  }
-
-  public void setExecutionOrder(int executionOrder) {
-    this.executionOrder = executionOrder;
-  }
-
   public List<String> getParameterNames() {
     return parameterNames;
   }

spock-core/src/main/java/org/spockframework/runtime/model/SpecElementInfo.java

@@ -31,9 +31,11 @@ public abstract class SpecElementInfo<P extends NodeInfo, R extends AnnotatedEle
   private String displayName;
 
   private boolean excluded = false;
+  private int executionOrder;
   private final List<Tag> tags = new ArrayList<>();
   private final List<Attachment> attachments = new ArrayList<>();
   private final List<IMethodInterceptor> interceptors = new ArrayList<>();
+
   @Override
   public boolean isSkipped() {
     return skipped;
@@ -75,6 +77,14 @@ public void setExcluded(boolean excluded) {
     this.excluded = excluded;
   }
 
+  public int getExecutionOrder() {
+    return executionOrder;
+  }
+
+  public void setExecutionOrder(int executionOrder) {
+    this.executionOrder = executionOrder;
+  }
+
   @Override
   public List<Tag> getTags() {
     return tags;

spock-core/src/main/java/org/spockframework/runtime/model/SpecInfo.java

@@ -48,8 +48,6 @@ public class SpecInfo extends SpecElementInfo<NodeInfo, Class<?>> implements IMe
   private ExecutionMode executionMode = null;
   private ExecutionMode childExecutionMode = null;
 
-  private int executionOrder;
-
   private String pkg;
   private String filename;
   private String narrative;
@@ -68,14 +66,6 @@ public class SpecInfo extends SpecElementInfo<NodeInfo, Class<?>> implements IMe
 
   private final List<FeatureInfo> features = new ArrayList<>();
 
-  public int getExecutionOrder() {
-    return executionOrder;
-  }
-
-  public void setExecutionOrder(int executionOrder) {
-    this.executionOrder = executionOrder;
-  }
-
   public String getPackage() {
     return pkg;
   }