Introduced new field FlowPathType to the Flow Path.
The initial set of valid values are:

    FP_TYPE_SHORTEST_PATH,              // Shortest path flow
    FP_TYPE_EXPLICIT_PATH               // Flow path with explicit flow entries

For now, the type field is not used (explicitly) yet.
diff --git a/web/add_flow.py b/web/add_flow.py
index 8100f22..0efa550 100755
--- a/web/add_flow.py
+++ b/web/add_flow.py
@@ -352,6 +352,8 @@
   flow_path = {}
   flow_path['flowId'] = flow_id
   flow_path['installerId'] = installer_id
+  # NOTE: The 'flowPathType' might be rewritten later
+  flow_path['flowPathType'] = 'FP_TYPE_EXPLICIT_PATH'
   flow_path['flowPathFlags'] = flowPathFlags
 
   if (len(match) > 0):
@@ -440,6 +442,8 @@
     parsed_args[idx]['actionOutputEnabled'] = False
 
     flow_path = compute_flow_path(parsed_args[idx], data_path)
+    flow_path['flowPathType'] = 'FP_TYPE_SHORTEST_PATH'
+
     add_shortest_path_flow(flow_path)
 
     idx = idx + 1