Allow to specify simulator OS version from cli

Summary:
When multiple simulator runtimes are available, this change will make it possible to specify which one to run. So assuming you have e.g. iOS 9.0 and 9.3 runtimes, all following calls will now work:
```
react-native run-ios --simulator "iPhone 6s (9.0)"
react-native run-ios --simulator "iPhone 6s (9.3)"
react-native run-ios --simulator "iPhone 6s"
```
Closes #8559

Differential Revision: D3516811

Pulled By: frantic

fbshipit-source-id: c81658f77e482e712293367b13d27e783e538aad

local-cli/runIOS/runIOS.js

@@ -65,7 +65,7 @@ function _runIOS(argv, config, resolve, reject) {
     reject(new Error(`Cound't find ${args.simulator} simulator`));
   }
 
-  const simulatorFullName = `${selectedSimulator.name} (${selectedSimulator.version})`;
+  const simulatorFullName = formattedSimulatorName(selectedSimulator)
   console.log(`Launching ${simulatorFullName}...`);
   try {
     child_process.spawnSync('xcrun', ['instruments', '-w', simulatorFullName]);
@@ -121,10 +121,14 @@ function _runIOS(argv, config, resolve, reject) {
 
 function matchingSimulator(simulators, simulatorName) {
   for (let i = simulators.length - 1; i >= 0; i--) {
-    if (simulators[i].name === simulatorName) {
+    if (simulators[i].name === simulatorName || formattedSimulatorName(simulators[i]) === simulatorName) {
       return simulators[i];
     }
   }
 }
 
+function formattedSimulatorName(simulator) {
+  return `${simulator.name} (${simulator.version})`;
+}
+
 module.exports = runIOS;