Python: Adjust to use the qlpack data-flow api.

Author: aschackmull

python/ql/lib/qlpack.yml

@@ -6,6 +6,7 @@ extractor: python
 library: true
 upgrades: upgrades
 dependencies:
+  codeql/dataflow: ${workspace}
   codeql/mad: ${workspace}
   codeql/regex: ${workspace}
   codeql/tutorial: ${workspace}

python/ql/lib/semmle/python/dataflow/new/DataFlow.qll

@@ -22,6 +22,8 @@ private import python
  * global (inter-procedural) data flow analyses.
  */
 module DataFlow {
-  import internal.DataFlow
+  private import internal.DataFlowImplSpecific
+  private import codeql.dataflow.DataFlow
+  import DataFlowMake<PythonDataFlow>
   import internal.DataFlowImpl1
 }