Add a mini-cinder volume create with resumption

Add a toy example showing how resumption works
in a miniaturized cinder like case. It allows
for the user of the example to kill the program
and later resume by providing back the initial
tracking id (think fedex/ups).

Change-Id: I7084ae50cf994e43b48c31bd22d60d77c78d50af
Fix several python3 incompatibilities

Change-Id: Ibf5dd6c0b6bcd161364daf35d618641f6079acf5
Merge "Add a mini-cinder volume create with resumption"