add a retry to getting available devices from instruments (fix #3796)

lib/devices/ios/ios.js

@@ -1004,7 +1004,7 @@ IOS.prototype.getBundleIdFromApp = function (cb) {
 IOS.prototype.checkDeviceAvailable = function (cb) {
   if (this.iOSSDKVersion >= 7.1) {
     logger.debug("Checking whether instruments supports our device string");
-    Instruments.getAvailableDevices(function (err, availDevices) {
+    Instruments.getAvailableDevicesWithRetry(3, function (err, availDevices) {
       var dString = this.getDeviceString();
       if (err) return cb(err);
       if (!_.contains(availDevices, dString)) {

package.json

@@ -43,7 +43,7 @@
     "adm-zip": "~0.4.4",
     "appium-adb": "~1.3.17",
     "appium-atoms": "~0.0.5",
-    "appium-instruments": "~1.4.8",
+    "appium-instruments": "~1.4.9",
     "appium-uiauto": "~1.7.13",
     "argparse": "~0.1.15",
     "async": "~0.9.0",