Behaviour of checkbox form inconsistent with select or text input form

When one creates a check box programmatically the default behavior is that all check boxes created are checked [1]. This is not consistent with the other dynamic forms (ex. text input and select) in which nothing is selected when they are created.

If one creates a check box via a template then one can specify which check boxes should be checked by default. As a fix maybe we can just set the check boxes to be unselected as a default behavior (when created programmatically)?

[1] https://github.com/apache/zeppelin/blob/master/spark/src/main/java/org/apache/zeppelin/spark/ZeppelinContext.java#L151