Bug 2030465

Cause: ovnkube-node & -master pods fail to start, when the config file contains an unknown field or section. Consequence: Can lead to failures on ovn-kubernetes updates, if a new config field or section was introduced. Imagine the following scenario: 1. ConfigMap is updated 2. ovnkube-node rollout starts 3. somehow an ovnkube-master pod needs to be (re-)started (be it through eviction from a node or something else) 4. the newly started ovnkube-master pod isn't aware of the new config structure (as it is still on the old version) and fails to parse the config, resulting in a crashloop of the newly ovnkube-master. This can result in a stucking rollout. Fix: Make ovn-kube resilient for unknown field in config files and logs a warning instead of exiting if such a field was found. Result: ovn-kube updates do not fail if config file contains an unknown field or section.