CB-10639 Appium tests: Added some timeouts,

Taking a screenshot on failure,
Retry taking a picture up to 3 times,
Try to restart the Appium session if it's lost

appium-tests/helpers/screenshotHelper.js

@@ -0,0 +1,37 @@
+/* jshint node: true */
+'use strict';
+
+var path = require('path');
+var screenshotPath = global.SCREENSHOT_PATH || path.join(__dirname, '../../appium_screenshots/');
+
+function generateScreenshotName() {
+    var date = new Date();
+
+    var month = date.getMonth() + 1;
+    var day = date.getDate();
+    var hour = date.getHours();
+    var min = date.getMinutes();
+    var sec = date.getSeconds();
+
+    month = (month < 10 ? "0" : "") + month;
+    day = (day < 10 ? "0" : "") + day;
+    hour = (hour < 10 ? "0" : "") + hour;
+    min = (min < 10 ? "0" : "") + min;
+    sec = (sec < 10 ? "0" : "") + sec;
+
+    return date.getFullYear() + '-' + month + '-' + day + '_' +  hour + '.' + min + '.' + sec + '.png';
+}
+
+module.exports.saveScreenshot = function (driver) {
+    var oldContext;
+    return driver
+        .currentContext()
+        .then(function (cc) {
+            oldContext = cc;
+        })
+        .context('NATIVE_APP')
+        .saveScreenshot(screenshotPath + generateScreenshotName())
+        .then(function () {
+            return driver.context(oldContext);
+        });
+};