Add helpers for wrapping file operations

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.

Note:
 This is now exposing what I think was just an issue in 
 ./tools/run-pylint.
 ./tools/run-pylint ./tests/unittests/test_filters/test_launch_index.py
and
 ./tools/run-pylint ./tests/unittests/test_simple_run 
 was always failing, but now I'm seeing errors.

need to fix that.  any tests that 'import helper' have issues.

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