Replace the deprecated .iteritems() with .items()

The `.iteritems()` method was [removed](https://docs.python.org/3/library/2to3.html#2to3fixer-dict)
in Python 3. The direct replacement is `.items()` (which is
backwards-compatible with Python 2).

This change means that the execution scripts `run_*.py` fail on
Python 3. This commit provides Python 3 compatibility without
compromising Python 2 execution.

See, for reference:
  - https://github.com/saltstack-formulas/openssh-formula/issues/48
  - https://stackoverflow.com/questions/10458437/what-is-the-difference-between-dict-items-and-dict-iteritems-in-python2

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