Demonstrations modified to use internal transports where appropriate.

Demonstration 4 was modified to use tun_flowctl.
https://github.com/adjacentlink/tun_flowctl.
Modifications to support changes in lxc-1.0.5. lxc-version is no
longer available and checks that were added to validate the presence
of hook scripts preclude using hook scripts that reside on mount
points.
Merge branch 'feature/internaltransport' into develop