Fixing some warnings during tests (#3648)

* ColorSchemeControl: fixing bad use of PropTypes

Accessing PropTypes via the main React package is deprecated, and will be
removed in React v16.0. Use the latest available v15.* prop-types package from
npm instead. For info on usage, compatibility, migration and more, see
https://fb.me/prop-types-docs

* Control: adding PropTypes.func in types allowed inside `value` prop

This removes a warning during yarn tests

Fix #3589

* tests(QueryStateLabel): removing missing prop warning

```
Warning: Failed prop type: The prop `query` is marked as required in
`QueryStateLabel`, but its value is `undefined`.
    in QueryStateLabel
```

* SaveQuery: removing invalid prop `target` supplied to `Overlay`.

This removes a warning during yarn tests:

```
Warning: Failed prop type: Invalid prop `target` supplied to `Overlay`.
```

* RunQueryActionButton: removing `isRequired` from queryState props

This removes a warning during yarn tests:
```
Warning: Failed prop type: The prop `queryState` is marked as required in
`RunQueryActionButton`, but its value is `null`.
```

superset/assets/javascripts/explore/components/Control.jsx

@@ -22,7 +22,8 @@ const propTypes = {
     PropTypes.string,
     PropTypes.number,
     PropTypes.bool,
-    PropTypes.array]),
+    PropTypes.array,
+    PropTypes.func]),
 };
 
 const defaultProps = {

superset/assets/javascripts/explore/components/controls/ColorSchemeControl.jsx

@@ -12,7 +12,7 @@ const propTypes = {
   onChange: PropTypes.func,
   value: PropTypes.string,
   default: PropTypes.string,
-  choices: PropTypes.arrayOf(React.PropTypes.array).isRequired,
+  choices: PropTypes.arrayOf(PropTypes.array).isRequired,
   schemes: PropTypes.object.isRequired,
   isLinear: PropTypes.bool,
 };