[docker-sonic-vs]: Add libzmq5 to docker-sonic-vs (sonic-net#5431)

libzmq5 is tcp/ipc communication library, needed by sairedis/syncd to communicate, as a new way (compared to current REDIS channel) to exchange messages which is faster than REDIS library and allows synchronous mode
this library is required in sairedis repo, swss repo, sonic-buildimage and sonic-build-tools to make it work

platform/vs/docker-sonic-vs/Dockerfile.j2

@@ -47,7 +47,8 @@ RUN apt-get install -y net-tools \
                        iptables \
                        python3-pip \
                        jq \
-                       python-m2crypto
+                       python-m2crypto \
+                       libzmq5
 
 # install redis-server
 RUN curl -o redis-tools_6.0.6-1~bpo10+1_amd64.deb "https://sonicstorage.blob.core.windows.net/packages/redis/redis-tools_6.0.6-1~bpo10+1_amd64.deb?sv=2015-04-05&sr=b&sig=73zbmjkf3pi%2Bn0R8Hy7CWT2EUvOAyzM5aLYJWCLySGM%3D&se=2030-09-06T19%3A44%3A59Z&sp=r"