Capture 'app' context for modinput input_items

- Update modularinput XML parsing to capture the 'app' tag for configuration
  stanza elements.  This value is stored in the input dict under '__app' to
  avoid potential naming collisions with user defined parameters.
- Updated unittest

Author: lowell80

splunklib/modularinput/utils.py

@@ -66,7 +66,9 @@ def parse_xml_data(parent_node, child_node_tag):
     for child in parent_node:
         if child.tag == child_node_tag:
             if child_node_tag == "stanza":
-                data[child.get("name")] = {}
+                data[child.get("name")] = {
+                    "__app": child.get("app", None)
+                }
                 for param in child:
                     data[child.get("name")][param.get("name")] = parse_parameters(param)
         elif "item" == parent_node.tag:

tests/modularinput/data/conf_with_2_inputs.xml

@@ -48,12 +48,14 @@ def test_parse_inputdef_with_two_inputs(self):
             "session_key": "123102983109283019283"
         }
         expectedDefinition.inputs["foobar://aaa"] = {
+            "__app": "search",
             "param1": "value1",
             "param2": "value2",
             "disabled": "0",
             "index": "default"
         }
         expectedDefinition.inputs["foobar://bbb"] = {
+            "__app": "my_app",
             "param1": "value11",
             "param2": "value22",
             "disabled": "0",