Add a new example test that will patch utils and os

functions so that they can be 'retargeted' to a temporary
directory, which allows us the ability to run a full set
of cloud-init stages.

Neat things:

1. All cloud-init code is unchanged (as long as it goes
   through the utils functions for most functionality)
2. Allows for a natural way to setup a temporary directory
   then patch the new directory as the new 'root' and then
   run cloud-init stages and then check the contents of 
   what was placed as desired.

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