fixed issue with runIOS not being able to launch tvOS app

Summary:
Yes.

Yes

Environment:
OS: MacOS X 10.12.6 (16G29)
Node: 8.9.4
Yarn: N/A
npm: 5.4.2
Watchman: Not Found
Xcode: 9.2 (9C40b)
Android Studio: N/A

[CLI iOS runIOS] When using `react-native-cli` to try to launch the tvOS scheme the user get's an error because the current implementation for launching simulators ignores any simulator/device who's name does not start with `iOS`

StackOverflow issue also found here :  https://stackoverflow.com/questions/48069690/how-to-select-project-to-run-tvos-version-with-npm-start

Actual command line steps
```
$npm i -g react-native-cli
...
$react-native init CoolProject
...
$cd CoolProject/
$react-native run-ios --simulator "Apple TV"  --scheme "CoolProject-tvOS"

Scanning folders for symlinks in /Users/jjiron/CoolProject/node_modules (7ms)
Found Xcode project CoolProject.xcodeproj
CoreData: annotation:  Failed to load optimized model at path '/Applications/Xcode.app/Contents/Applications/Instruments.app/Contents/Frameworks/InstrumentsPackaging.framework/Versions/A/Resources/XRPackageModel.momd/XRPackageModel 9.0.omo'

Could not find Apple TV simulator
```

The cli tool should launch the tvOS application on the simulator.

The user get's an error message saying "Could not find Apple TV simulator"

Don't ignore appletv simulators when looking for simulators to launch. Also use the correct application build when selecting which app to launch on the simulator/device.

Added automated test for `findMatchingSimulator.js` to allow tvOS simulators

[react-native-cli] Fixed issue where you cannot launch tvOS app on Apple TV simulator
Closes facebook/react-native#17660

Differential Revision: D6806327

Pulled By: hramos

fbshipit-source-id: 1a4f37058f3c5d8223012a3e4050e7bbfaafa6c4

Author: Joey Jiron

runIOS/__tests__/findMatchingSimulator-test.js

@@ -453,4 +453,37 @@ describe('findMatchingSimulator', () => {
       version: 'iOS 10.0'
     });
   });
+
+  it('should return AppleTV devices if in the list', () => {
+    expect(findMatchingSimulator({
+      'devices': {
+        'tvOS 11.2' : [
+          {
+            'state' : 'Booted',
+            'availability' : '(available)',
+            'name' : 'Apple TV',
+            'udid' : '816C30EA-38EA-41AC-BFDA-96FB632D522E'
+          },
+          {
+            'state' : 'Shutdown',
+            'availability' : '(available)',
+            'name' : 'Apple TV 4K',
+            'udid' : 'BCBB7E4B-D872-4D61-BC61-7C9805551075'
+          },
+          {
+            'state' : 'Shutdown',
+            'availability' : '(available)',
+            'name' : 'Apple TV 4K (at 1080p)',
+            'udid' : '1DE12308-1C14-4F0F-991E-A3ADC41BDFFC'
+          }
+        ]
+      }
+    },
+    'Apple TV'
+  )).toEqual({
+    udid: '816C30EA-38EA-41AC-BFDA-96FB632D522E',
+    name: 'Apple TV',
+    version: 'tvOS 11.2'
+  });
+  });
 });

runIOS/findMatchingSimulator.js

@@ -26,8 +26,8 @@ function findMatchingSimulator(simulators, simulatorName) {
   const devices = simulators.devices;
   var match;
   for (let version in devices) {
-    // Making sure the version of the simulator is an iOS (Removes Apple Watch, etc)
-    if (version.indexOf('iOS') !== 0) {
+    // Making sure the version of the simulator is an iOS or tvOS (Removes Apple Watch, etc)
+    if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {
       continue;
     }
     for (let i in devices[version]) {

runIOS/runIOS.js

@@ -15,8 +15,18 @@ const findXcodeProject = require('./findXcodeProject');
 const findReactNativeScripts = require('../util/findReactNativeScripts');
 const parseIOSDevicesList = require('./parseIOSDevicesList');
 const findMatchingSimulator = require('./findMatchingSimulator');
-const getBuildPath = function(configuration = 'Debug', appName, isDevice) {
-  return `build/Build/Products/${configuration}-${isDevice ? 'iphoneos' : 'iphonesimulator'}/${appName}.app`;
+const getBuildPath = function (configuration = 'Debug', appName, isDevice) {
+  let device;
+
+  if (isDevice) {
+    device = 'iphoneos';
+  } else if (appName.toLowerCase().includes('tvos')) {
+    device = 'appletvsimulator';
+  } else {
+    device = 'iphonesimulator';
+  }
+
+  return `build/Build/Products/${configuration}-${device}/${appName}.app`;
 };
 const xcprettyAvailable = function() {
   try {
@@ -261,6 +271,10 @@ module.exports = {
     desc: "Run on a connected device, e.g. Max's iPhone",
     cmd: 'react-native run-ios --device "Max\'s iPhone"',
   },
+  {
+    desc: 'Run on the AppleTV simulator',
+    cmd: 'react-native run-ios --simulator "Apple TV"  --scheme "helloworld-tvOS"',
+  }
   ],
   options: [{
     command: '--simulator [string]',