Add libzmq5 as dependency for ubuntu-20.04 build (#7)

Co-authored-by: Ubuntu <zain@zb-dev-vm.022x1jpnpm4u1iy2d325acts3c.yx.internal.cloudapp.net>

Author: zbud-msft

azure-pipelines.yml

@@ -62,7 +62,7 @@ stages:
         sudo apt-get update
         sudo apt-get install -y make libtool m4 autoconf dh-exec debhelper cmake pkg-config \
                          libhiredis-dev libnl-3-dev libnl-genl-3-dev libnl-route-3-dev libnl-nf-3-dev swig3.0 \
-                         libpython2.7-dev libboost-dev libboost1.71-dev
+                         libpython2.7-dev libboost-dev libboost1.71-dev libzmq5
         sudo apt-get install -y sudo
         sudo apt-get install -y redis-server redis-tools
         sudo apt-get install -y python3-pip