Fix the issue that a dataset format is set to None,
even if user specify correctly.
Change-Id: I99d5d084edf9f339400dd44ac2579ff08619d9cf
Closes-Bug: #1662795
Modal parameters differs depending
on the prediction model.
Modify a model creation dialog so that
only necessary parameters are showing up
when selecting prediction model.
Dataset parameters are needed when creating some resources
for instance Dataset, Model, Model Evaluation.
Add a common dataset dialog to avoid redundant expression.
Hiroyuki Eguchi