Openwisp-utils

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- [deps] Updated django-filter range: >=2.2.0<2.4.0

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- [fix] Fixed commit message check when close/fix keyword is missing
- [change] Changed QA commit check prefix hint to mention conventional commit prefixes

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- [fix] Commit check run only on Pull Request & workbench
- [deps] Added support for django 3.1
- [ux/admin-theme] Force z-index on main menu to stay on top

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Features
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- [admin] ``TestReadOnlyAdmin``: added support for exclude attribute

Changes
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- [change] Changed QA checks to use isort~=5.0 instead of isort<=4.3;
**this will cause changes to the way the code is formatted**
- Always execute ``commitcheck`` when run locally
(on travis it will be run only in pull requests)

Bugfixes
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- [admin] Fixed a bug which caused some menu items to be shown also if the
user did not have permission to view or edit them
- [qa] Fixed a regression which caused ``commitcheck`` to not be run on travis pull requests
- [tests] Fixed ``SITE_ID`` in test project settings

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- [feature] Added ``TimeLoggingTestRunner`` to detect slow tests
- [fix] Admin-theme: ensure menu is above other CSS elements
- [fix] Removed ``/tests`` directory from python package

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- [fix] Fix crash when pending migrations check fails
- [add] default_or_test function
- [add] Added deep_merge_dicts function
- [add] formatter: black<=19.10b0
- [add] OPENWISP_API_INFO setting
- [add][api] Require authentication for API docs if DEBUG is False
- [add][api] Implement ScopedRateThrottle by default
- [add][api] Introduced api.ApiAppConfig
- [add][rest] optional swagger API endpoints
- [add][rest] django-filter
- [docs] Re-ordered, added information and improved existing docs
- [update] Added support for flake8 flake8<=3.9
- [change] Renamed test_api to api for consistency
- [change] Rename openwisp-utils-qa-checks to openwisp-qa-check
- [change][api] Renamed /api/v1/swagger/ to /api/v1/docs/
- [improvement] Moved to importlib for Dependency loader & staticfiles for importing files
- [improvement] Added "Related to <issue>" for commit-check
- [enchancement] Added strict mode to run-qa-checks