MQE-583: set licensing in composer.json.

Author: jilu1

composer.json

@@ -2,6 +2,7 @@
     "name": "magento/magento2-functional-testing-framework",
     "type": "library",
     "description": "Magento2 Functional Testing Framework",
+    "license": "AGPL-3.0",
     "keywords": ["magento", "automation", "functional", "testing"],
     "require": {
         "php": "7.0.2|7.0.4|~7.0.6|~7.1.0",