Udica

* Enable container port, not the host port
* Refactor engine-specific handling code to use classes
* Add --version command-line argument

* sctp socket support
* Add Code of Conduct
* Update permission set for generated rules
* Add Security Policy
* Use constants for engines
* Fix some formatting issues in udica man page
* Fix parsing ports from podman engine v2.0.2
* Update test suite to align with podman 2.0.2

* New feature: parameter "--container-engine"
* Update json_is_podman_format() function
* Make udica code compliant to the PEP-8 style.
* Add support for python code formatter black in CI
* Update travis CI to test unit tests also on CentOS 8 image

- Fix unused imports
- Add lint target for Makefile
- Add Dockerfile for udica container
- Separate unit from integration tests
- Add basic Makefile
- Refactor tests so they're run from top directory
- udica/policy.py: Remove unused imports
- Update man pages and README because of CRI support
- Update testsuite for CRI support.
- Fix gen. policy when no template is used in CRI
- Add inspect file generated from CRI-O to tests
- Initial CRI-O support
- Cirrus: Update VM image name
- Improve permission set for log_container template
- Document supported container engine versions
- Add initial support for Cirrus-CI testing
- Update tests test_basic.podman.cil, test_basic.docker.cil. Round 2

Special Thanks to: cevich JAORMX WOnder93 for their help on this release!

* New feature: Cross Container Communication
* Udica is able append rules based on AVC msgs
* Increase udica testsuite
* Fix udica CI tests
* Prioritize templates from current directory.
* Update tests test_basic.podman.cil, test_basic.docker.cil

* Fix udica parsing podman json file
* Unify exit codes
* Clean up the test helper
* Update .gitignore to ignore __pycache__ dirs
* Improve parse error handling
* Get SELinux context of mountpoint from xattr
* Make base udica container part of domain attribute