undo delete perl cmd to update release-1.11 image

Signed-off-by: 马洪贞 <hzma@alauda.io>

Author: hongzhen-ma

dist/images/Dockerfile

@@ -17,7 +17,6 @@ RUN deluser sync &&\
     deluser tss
 
 RUN rm -f /usr/bin/nc && \
-    rm -f /usr/bin/perl && \
     rm -f /usr/bin/netcat
 
 COPY kube-ovn-cmd /kube-ovn/kube-ovn-cmd