Add firewall rules for demo outbound connectivity

Change-Id: I9714247409bb5c106731a393282be45eb72ee239
Build keystonerc_demo for demo user

If provisioning a demo network with a demo keystone user, create
the keystonerc_demo file. Also makes the demo user password
configurable.

Change-Id: I4b85a3389c273dc9d77d0cd6674b9b59f633afa7
Merge "Build keystonerc_demo for demo user"