Merge remote-tracking branch 'mainline/develop' into develop-prs

Author: Oleksii Korshenko

dev/tests/functional/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "magento/mtf": "1.0.0-rc55",
+        "magento/mtf": "1.0.0-rc56",
         "php": "7.0.2|~7.0.6|~7.1.0",
         "phpunit/phpunit": "~4.8.0|~5.5.0",
         "phpunit/phpunit-selenium": ">=1.2"