Add some sample scripts

This is a very basic starting point for working code example usage of
the SDK.

The common module includes an argument parser that recognizes the common
authentication arguments so setting up auth against a running OpenStack
cloud is the same as the library CLIs.

The inital example for Transport is a couple of simple GETs that also
shows the connection pooling.

Change-Id: I07de2888471a39cbc43daedded36ad683d02a472
Merge "Add some sample scripts"