install docker-ns in test VMs

handy for debugging

test/config.sh

@@ -45,3 +45,4 @@ end_suite() {
 }
 
 WEAVE=./bin/weave
+DOCKER_NS=./bin/docker-ns

test/setup.sh

@@ -12,7 +12,9 @@ for HOST in $HOST1 $HOST2; do
     docker_on $HOST load -i /var/tmp/weave.tar
     docker_on $HOST load -i /var/tmp/weavedns.tar
     run_on $HOST mkdir -p `dirname $WEAVE`
-    cat ../weave | run_on $HOST sh -c "cat > $WEAVE"
+    cat ../weave         | run_on $HOST sh -c "cat > $WEAVE"
+    cat ../bin/docker-ns | run_on $HOST sh -c "cat > $DOCKER_NS"
     run_on $HOST chmod a+x $WEAVE
+    run_on $HOST chmod a+x $DOCKER_NS
     run_on $HOST sudo service docker restart
 done