Fix PyLint errors discovered when upgrading to newer version

* Fixes PyLint to run in the virtualenv used for all tests

* Replaced 'LooseVersion' with 'parse_version' from setuptools
- This is a work around for the issue in
  https://github.com/PyCQA/pylint/issues/73 in which pylint can not
  import disutils.version correctly in a virtualenv.

* Removed the unused function 'delete_hosts' which was causing a
  pylint error as well

* Removed a deprecated pylint pragma option, 'bad-builtin'

* Fixed some import ordering issues it was picky about

* Added another disable for a case where the PyLint suggestion would
  have us altering the container we would be iterating over

* Add code-coverage reports to the unittests with the MINIMUM coverage
  percentage for success set to 70%
- Current test coverage is at 76%

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