Fix Dockerfile

Issue-ID: DCAEGEN2-465
Change-Id: I9ac4e188002f873cbf5aceccc5947ec4e49709f9
Signed-off-by: Lusheng Ji <lji@research.att.com>
diff --git a/Dockerfile b/Dockerfile
index d967b0c..f3c7ecb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,4 +32,4 @@
 VOLUME ${APPDIR}/logs
 
 # Run run_policy.sh when the container launches
-CMD ["./bin/snmptrapd.sh start"]
+CMD ["./bin/snmptrapd.sh", "start"]