server: Add size to listUsageRecords response for VMSnapShotOnPrimary (type 27) (#3529)

Add size to list usage records for VMSnapShotOnPrimary (type 27).
The size was included in description but missing from response.

Author: Anurag Awasthi

server/src/main/java/com/cloud/api/ApiResponseHelper.java

@@ -3684,6 +3684,7 @@ public UsageRecordResponse createUsageResponse(Usage usageRecord, Map<String, Se
                 usageRecResponse.setDescription(builder.toString());
             }
         } else if (usageRecord.getUsageType() == UsageTypes.VM_SNAPSHOT_ON_PRIMARY) {
+            usageRecResponse.setSize(usageRecord.getVirtualSize());
             if (!oldFormat) {
                 final StringBuilder builder = new StringBuilder();
                 builder.append("VMSnapshot on primary storage usage");