Implement AggregationSourceCollection

This is an intermediate step in setting up aggregation sources. A
future patch will add aggregation sources based on the existence of
satellite configs.  For now the collection will always return as 0
members.

Adds the AggregationSourceCollection schema which we previously
ignored.

Tested:
Service Validator passes

Signed-off-by: Carson Labrado <clabrado@google.com>
Change-Id: I65c9231289bf0a9b6392696d55bc3feb0023c694
diff --git a/static/redfish/v1/$metadata/index.xml b/static/redfish/v1/$metadata/index.xml
index 0ef12fa..92bcc09 100644
--- a/static/redfish/v1/$metadata/index.xml
+++ b/static/redfish/v1/$metadata/index.xml
@@ -118,6 +118,9 @@
         <edmx:Include Namespace="AggregationService.v1_0_0"/>
         <edmx:Include Namespace="AggregationService.v1_0_1"/>
     </edmx:Reference>
+    <edmx:Reference Uri="/redfish/v1/schema/AggregationSourceCollection_v1.xml">
+        <edmx:Include Namespace="AggregationSourceCollection"/>
+    </edmx:Reference>
     <edmx:Reference Uri="/redfish/v1/schema/Assembly_v1.xml">
         <edmx:Include Namespace="Assembly"/>
         <edmx:Include Namespace="Assembly.v1_0_0"/>