MAGETWO-81281: Stabilize 2.2-develop branch on CI

Author: kokoc

dev/tests/functional/tests/app/Magento/Variable/Test/TestCase/UpdateCustomVariableEntityTest.xml

@@ -31,6 +31,7 @@
             <constraint name="Magento\Variable\Test\Constraint\AssertCustomVariableInPage" />
         </variation>
         <variation name="UpdateCustomVariableEntityTestVariation3">
+            <data name="tag" xsi:type="string">stable:no</data>
             <data name="customVariable/data/code" xsi:type="string">variableCode%isolation%</data>
             <data name="customVariable/data/name" xsi:type="string">variableName%isolation%</data>
             <data name="customVariable/data/use_default_value" xsi:type="string">No</data>