Kytos-utils

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Added
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- Added a template for ``setup.py`` to be used in NApp creation.

Changed
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- Updated How to Contribute link in README.rst.
- Updated module ``kytos/cli/commands/napps/api.py`` to handle HTTP code 400.
- Updated tests for the ``install_napp`` method.

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Added
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- Added ``tags`` decorator to run tests by type and size.

Fixed
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- Fixed error message in the ``get_enabled`` method.
- Fixed Travis false positive when tests failed.
- Fixed lzma module error when Scrutinizer runs unit tests.

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Added
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- New unit tests: improved coverage from 22% to 92%.

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Added
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- Enabled Travis CI.

Fixed
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- Fixed some linter issues.

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Changed
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- Upgraded versions for all dependencies
- Change config files creation to run time

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Added
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- Added long description field for display in pypi.org.

Changed
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- `kytos napps upload` also ignores patterns listed inside
user's `.gitignore`.

Fixed
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- kytos-utils can run any command even if kytos isn't running.
- Fixed Scrutinizer coverage error.