Python: Move dataflow TestUtil to importable location

python/ql/test/TestUtilities/dataflow/callGraphConfig.qll

@@ -0,0 +1,22 @@
+private import python
+import semmle.python.dataflow.new.DataFlow
+private import semmle.python.dataflow.new.internal.DataFlowPrivate as DataFlowPrivate
+
+/**
+ * A configuration to find the call graph edges.
+ */
+module CallGraphConfig implements DataFlow::ConfigSig {
+  predicate isSource(DataFlow::Node node) {
+    node instanceof DataFlowPrivate::ReturnNode
+    or
+    node instanceof DataFlow::ArgumentNode
+  }
+
+  predicate isSink(DataFlow::Node node) {
+    node instanceof DataFlowPrivate::OutNode
+    or
+    node instanceof DataFlow::ParameterNode
+  }
+}
+
+module CallGraphFlow = DataFlow::Global<CallGraphConfig>;