Java: Adjust scripts for new location.

java/ql/src/utils/model-generator/GenerateFlowModel.py

@@ -1,5 +1,14 @@
 #!/usr/bin/python3
 
+import sys
+import os.path
+import subprocess
+
+# Add Model as Data script directory to sys.path.
+gitroot = subprocess.check_output(["git", "rev-parse", "--show-toplevel"]).decode("utf-8").strip()
+madpath = os.path.join(gitroot, "misc/scripts/models-as-data/")
+sys.path.append(madpath)
+
 import generate_flow_model as model
 
 language = "java"