* Issue #39860: Add 'not_contains' method to parsing.py
* Issue #30860 Adds self.negate to Conditional class in lib/ansible/module_utils/network/common/parsing.py
* Issue #39860 Fix singleton-comparison issue per sanity tests
* Issue #39860 'test/integration/targets/nxos_command/tests/cli/not_comparison_operator.yaml' integration test
* Issue #39860 Add unit tests to '../../test/units/module_utils/network/common/test_parsing.py'
* Issue #39860 Fix singleton comparison issue
* Fix E302 expected 2 blank lines, found 1
* Issue #39860 Add license header to unit tests
* Issue #39860 Move integration test to 'test/integration/targets/nxos_command/tests/common/'; remove unnecessary comment from unit test
* Issue #39860 remove unnecessary comment from unit test
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