Excluding grpc-gateway generated files from licensecheck

Change-Id: Ibe9fcfa942336f58e195d981a3932bee70792a27
diff --git a/jjb/shell/licensecheck.sh b/jjb/shell/licensecheck.sh
index 5bbcdf8..c358294 100755
--- a/jjb/shell/licensecheck.sh
+++ b/jjb/shell/licensecheck.sh
@@ -67,6 +67,7 @@
   ! -name "*.p12" \
   ! -name "*.patch" \
   ! -name "*.pb.go" \
+  ! -name "*.pb.gw.go" \
   ! -name "*.pdf" \
   ! -name "*.pcap" \
   ! -name "*.pem" \