This is a foundation for CLI work, still has rough spots but works for
two PoC commands - rack-list and rack-show (communicates with Tuskar,
prints). There's remaining stuff to be solved:
* Allow arbitrary formatting of attributes (bug #1213056)
* Add help support for subcommands (bug #1213050)
* Allow finding resources by name (bug #1213053)
* Allow auth with pre-existing token and Keystone URL (bug #1213052)
Fixes bug #1211826
Change-Id: I9364be37c7111c85ef46be82b157782a14743004
add9e5da58