[FIXED JENKINS-18534] equals()/hashCode() for parameter value

The default implementation considers parameters with the same name
to be identical, resulting in queue items being collapsed.

With this change, different values for a parameter will result in
different builds.

src/main/java/hudson/scm/listtagsparameter/ListSubversionTagsParameterValue.java

@@ -64,6 +64,28 @@ public String resolve(String name) {
     };
   }
 
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (!(o instanceof ListSubversionTagsParameterValue)) return false;
+    if (!super.equals(o)) return false;
+
+    ListSubversionTagsParameterValue that = (ListSubversionTagsParameterValue) o;
+
+    if (tag != null ? !tag.equals(that.tag) : that.tag != null) return false;
+    if (tagsDir != null ? !tagsDir.equals(that.tagsDir) : that.tagsDir != null) return false;
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    int result = super.hashCode();
+    result = 31 * result + (tagsDir != null ? tagsDir.hashCode() : 0);
+    result = 31 * result + (tag != null ? tag.hashCode() : 0);
+    return result;
+  }
+
   public String getTag() {
     return tag;
   }