[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;
  }