Move to 2021.3

Update the script to point at 2021.3, change the path of the files since
they moved again, and run the script.

Since we have an exclude list, this only brings in new versions of
schemas bmcweb already uses.

Overview of 2021.3:
https://www.dmtf.org/sites/default/files/Redfish_Release_2021.3_Overview.pdf

Overall, the release wasn't huge.

IBM plans to use:
PCIeSlot to Processor
FabricAdapter to PCIeDevice

Tested: See new schemas. No new validator errors.
curl -k https://$bmc/redfish/v1/JsonSchemas/Certificate/Certificate.json
{
    "$id": "http://redfish.dmtf.org/schemas/v1/Certificate.v1_5_0.json",

Change-Id: Idf28cb164d220b059dace91e352fee732bf0c842
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/static/redfish/v1/schema/Chassis_v1.xml b/static/redfish/v1/schema/Chassis_v1.xml
index 0ea631b..824c4af 100644
--- a/static/redfish/v1/schema/Chassis_v1.xml
+++ b/static/redfish/v1/schema/Chassis_v1.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!---->
 <!--################################################################################       -->
-<!--# Redfish Schema:  Chassis v1.17.0                                                     -->
+<!--# Redfish Schema:  Chassis v1.18.0                                                     -->
 <!--#                                                                                      -->
 <!--# For a detailed change log, see the README file contained in the DSP8010 bundle,      -->
 <!--# available at http://www.dmtf.org/standards/redfish                                   -->
@@ -112,6 +112,9 @@
   <edmx:Reference Uri="http://redfish.dmtf.org/schemas/v1/Cable_v1.xml">
     <edmx:Include Namespace="Cable"/>
   </edmx:Reference>
+  <edmx:Reference Uri="http://redfish.dmtf.org/schemas/v1/Outlet_v1.xml">
+    <edmx:Include Namespace="Outlet"/>
+  </edmx:Reference>
 
   <edmx:DataServices>
 
@@ -1590,5 +1593,33 @@
       </ComplexType>
     </Schema>
 
+    <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="Chassis.v1_18_0">
+      <Annotation Term="Redfish.OwningEntity" String="DMTF"/>
+      <Annotation Term="Redfish.Release" String="2021.3"/>
+
+      <EntityType Name="Chassis" BaseType="Chassis.v1_17_0.Chassis">
+        <Property Name="ElectricalSourceManagerURIs" Type="Collection(Edm.String)">
+          <Annotation Term="OData.Permissions" EnumMember="OData.Permission/ReadWrite"/>
+          <Annotation Term="OData.Description" String="The URIs of the management interfaces for the upstream electrical source connections for this chassis."/>
+          <Annotation Term="OData.LongDescription" String="This property shall contain an array of URIs to the management applications or devices that provide monitoring or control of the upstream electrical sources that provide power to this chassis."/>
+          <Annotation Term="OData.IsURL"/>
+        </Property>
+        <Property Name="ElectricalSourceNames" Type="Collection(Edm.String)">
+          <Annotation Term="OData.Permissions" EnumMember="OData.Permission/ReadWrite"/>
+          <Annotation Term="OData.Description" String="The names of the upstream electrical sources, such as circuits or outlets, connected to this chassis."/>
+          <Annotation Term="OData.LongDescription" String="This property shall contain an arrays of strings that identify the upstream electrical sources, such as the names of circuits or outlets, that provide power to this chassis."/>
+        </Property>
+      </EntityType>
+
+      <ComplexType Name="Links" BaseType="Chassis.v1_17_0.Links">
+        <NavigationProperty Name="PowerOutlets" Type="Collection(Outlet.Outlet)">
+          <Annotation Term="OData.Permissions" EnumMember="OData.Permission/ReadWrite"/>
+          <Annotation Term="OData.Description" String="An array of links to the outlets that provide power to this chassis."/>
+          <Annotation Term="OData.LongDescription" String="This property shall contain an array of links to resources of type Outlet that represent the outlets that provide power to this chassis."/>
+          <Annotation Term="OData.AutoExpandReferences"/>
+        </NavigationProperty>
+      </ComplexType>
+    </Schema>
+
   </edmx:DataServices>
 </edmx:Edmx>