Kytos-utils

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Added
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- `kytos web update` command to update the Kytos Web User Interface to the
latest version.

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Added
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- `kytos napps prepare` command to generate openapi.yml skeleton file

Changed
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- Dependency installation/update for devs:
`pip install -Ur requirements/dev.txt`. To use cloned kytos repos as
dependencies, reinstall that repos with `pip install -e .` in the end.
- Improvements on napps dependencies management.

Fixed
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- Linter issues.
- Unneeded running Kytosd requirement.

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Added
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- Version tags - now NApps fully support the <username>/<nappname>:<version> format.
- Create an OpenAPI skeleton based on NApp's rest decorators.

Changed
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- NApps will now install other NApps listed as dependencies.
- Do not require a running kytosd for some commands.
- Yala substitutes Pylama as the main linter checker.
- Requirements files updated and restructured.

Fixed
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- Some test features.
- Some bug fixes.

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Fixed
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- NApp skel to match changes in Kytos