Fix some xml issues in yaml

common/lib/xmodule/xmodule/templates/combinedopenended/default.yaml

 ---
 metadata:
     display_name: Open Ended Response
-    rerandomize: never
-    showanswer: never
-    weight: ""
-    attempts: 10
+    attempts: 1
     max_score: 1
     is_graded: False
     version: 1
-    display_name: Test Question
+    display_name: Open Ended Response
+    skip_spelling_checks: False
+    accept_file_upload: False
 data: |
-  <combinedopenended attempts="10" max_score="1" display_name = "Open Ended Response" is_graded="True" version="1">
+  <combinedopenended>
   	<rubric>
   		<rubric>
   		    <category>

common/lib/xmodule/xmodule/templates/peer_grading/default.yaml

 ---
 metadata:
     display_name: Peer Grading Interface
-    rerandomize: never
-    showanswer: never
-    weight: ""
-    attempts: ""
+    attempts: 1
+    use_for_single_location: False
+    link_to_location: None
+    is_graded: False
 data: |
-  <peergrading use_for_single_location="False" is_graded="False" display_name = "Peer Grading Panel">
+  <peergrading>
   </peergrading>
 
 children: []