Modify react-native mock to require react instead of react/addons
Modify react-native mock to require react instead of react/addons

react/addons has been deprecated in favor of react-addons-{addon}.
Since we don't seem to be using any specific addon here, this commit removes the use of /addons to eliminate the deprecation warning message.

ertrzyiks/react-native-component-test,ertrzyiks/react-native-component-test