[ANDROID] nested ScrollView conflicted with parent refreshControl of ScrollView

Hi!

Scrolling done nested ScrollView trying pull parent refreshControl when parent ScrollView position is on top. 
```

<ScrollView refreshControl={<RefreshControl refreshing={refreshing} onRefresh={this._onRefresh} />}>
    <ScrollView nestedScrollEnabled>
    </ScrollView>
</ScrollView>
```

Without refreshControl everything works perfect 