demo: Make sure the infrakit 'cli' directory exists

Otherwise there is a warning on first use.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

projects/demo/etcd/start-infrakit.sh

@@ -6,6 +6,7 @@ INFRAKIT_HOME=~/.infrakit
 IK_PLUGINS=$INFRAKIT_HOME/plugins
 
 rm -rf $INFRAKIT_HOME
+mkdir -p $INFRAKIT_HOME/cli
 
 infrakit-flavor-vanilla &
 infrakit-instance-hyperkit &