adding kafka package to xos-unit test

Change-Id: I2df474d337bb81bd44212ab743e4bcce0a4961a3
diff --git a/jjb/xos-unit.yaml b/jjb/xos-unit.yaml
index 6d16939..74400e4 100644
--- a/jjb/xos-unit.yaml
+++ b/jjb/xos-unit.yaml
@@ -64,6 +64,7 @@
           pip install ipaddress==1.0.19
           pip install grpcio==1.9.1
           pip install grpcio-tools==1.9.1
+          pip install kafka==1.3.5
           echo "Requirements Installed"
 
           cd $BASEDIR/cord/orchestration/xos/lib/xos-util; python setup.py install; echo "xos-util Installed"