delete user tss (#2838)

Author: hongzhen-ma

dist/images/Dockerfile

@@ -14,7 +14,8 @@ WORKDIR /kube-ovn
 RUN /kube-ovn/iptables-wrapper-installer.sh --no-sanity-check
 RUN rm -f /usr/bin/nc &&\
     rm -f /usr/bin/netcat
-RUN deluser sync
+RUN deluser sync &&\
+    deluser tss
 
 COPY kube-ovn-cmd /kube-ovn/kube-ovn-cmd
 COPY kube-ovn-webhook /kube-ovn/kube-ovn-webhook