Update policheck_exclusions.xml (microsoft#177)

Author: natke

ci_build/policheck_exclusions.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <PoliCheckExclusions>
-  <Exclusion Type="FileName">LABEL.CS|SYNSET.TXT|COCO-OBJECT-CATEGORIES-2017.JSON|ONNX_COCO_CLASSES.TXT|DEV-V1.1.JSON|DEV-V2.0.JSON|VOCAB.TXT|INSTANCES_VAL2017.JSON|RESNETLABELMAP.CS</Exclusion>
+  <Exclusion Type="FileName">LABEL.CS|SYNSET.TXT|COCO-OBJECT-CATEGORIES-2017.JSON|ONNX_COCO_CLASSES.TXT|DEV-V1.1.JSON|DEV-V2.0.JSON|VOCAB.TXT|INSTANCES_VAL2017.JSON|RESNETLABELMAP.CS|IMAGENET1000_CLSIDX_TO_LABELS.TXT</Exclusion>
 </PoliCheckExclusions>