Merge pull request #143 from magento-tango/MAGETWO-52844-2.1

[Tango] Code Changes for Unstable Functional Acceptance Tests Plan

dev/tests/functional/testsuites/Magento/Mtf/TestSuite/InjectableTests/acceptance_unstable.xml

+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © 2016 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="../../../../../vendor/magento/mtf/Magento/Mtf/TestRunner/etc/testRunner.xsd">
+    <rule scope="testcase">
+        <allow>
+            <tag group="test_type" value="acceptance_test" />
+        </allow>
+    </rule>
+    <rule scope="variation">
+        <allow>
+            <tag group="test_type" value="acceptance_test" />
+            <tag group="stable" value="no" />
+        </allow>
+    </rule>
+</config>