add setNativeProps to SectionList

Summary:
```js
componentDidMount() {
  this._list.setNativeProps({scrollEnabled: false})
}

render() {
  const sections = [
    {key: 'foo', data: [{name: 'Jone Doe', key: 'a'}, {name: 'Susan Briz', key: 'b'}],
    {key: 'bar', data: [{name: 'David Mark', key: 'c'}, {name: 'Daniel Campbell', key: 'd'}]
  ]

  return (
    <SectionList
      ref={c => (this._list = c)}
      sections={sections}
      renderItem={({item}) => <Text>{item.name}<Text>}
    />
  )
}
```
Closes #15328

Differential Revision: D5546636

Pulled By: javache

fbshipit-source-id: 25aec067879be1571db5c3a09b5f0952826220ac

Libraries/Lists/SectionList.js

@@ -317,6 +317,13 @@ class SectionList<SectionT: SectionBase<any>> extends React.PureComponent<
  }
  }
 
+ setNativeProps(props: Object) {
+ const listRef = this._wrapperListRef && this._wrapperListRef.getListRef();
+ if (listRef) {
+ listRef.setNativeProps(props);
+ }
+ }
+
  render() {
  const List = this.props.legacyImplementation
  ? MetroListView