Allocate pseudo tty for ssh

Change-Id: I43e977ce5099b9d593e3e36bd6f2a0f540b54419
diff --git a/tools/test/bin/onos-config b/tools/test/bin/onos-config
index d8bc8c2..6ef95ae 100755
--- a/tools/test/bin/onos-config
+++ b/tools/test/bin/onos-config
@@ -18,7 +18,7 @@
 echo "]}" >> $CDEF_FILE
 scp -q $CDEF_FILE $remote:$ONOS_INSTALL_DIR/config/cluster.json
 
-ssh $remote "
+ssh -t $remote "
     sudo perl -pi.bak -e \"s/            <interface>.*</            <interface>${ONOS_NIC:-192.168.56.*}</g\" \
         $ONOS_INSTALL_DIR/$KARAF_DIST/etc/hazelcast.xml
     sudo perl -pi -e \"s/        <name>onos</        <name>${ONOS_CELL:-onos}</g\" \