[TASK] Add coverage configuration for functional tests (#1092)

We already had this for unit tests, but it was missing for
functional tests.

Also, we do not need to provide a path in this configuration - it
suffices to have this node present in the configuration files.

Closes #1078

Tests/Functional/FunctionalTests.xml

@@ -20,6 +20,7 @@
     stopOnSkipped="false"
     verbose="false"
 >
+    <coverage/>
     <testsuites>
         <testsuite name="Functional tests">
             <!--

Tests/Unit/UnitTests.xml

@@ -21,6 +21,7 @@
     stopOnSkipped="false"
     verbose="false"
 >
+    <coverage/>
     <testsuites>
         <testsuite name="Unit tests">
             <!--
@@ -30,14 +31,6 @@
             <directory suffix="Test.php">./</directory>
         </testsuite>
     </testsuites>
-    <coverage>
-        <include>
-            <!--
-                This path needs an adaption in extensions, when coverage statistics are wanted.
-            -->
-            <directory>../../../../../../typo3/sysext/*/Classes/</directory>
-        </include>
-    </coverage>
     <php>
         <!-- @deprecated: will be removed with next major version, constant TYPO3_MODE is deprecated -->
         <const name="TYPO3_MODE" value="BE"/>