Description of problem:
The startup script for ovnkube-master container starts ovn-nbctl daemon that logs to ovn-nbctl.log file. However, apart from tailing it, nothing is done with that file. Concretely, it is never rotated.
Recently, one 4.8 cluster has hit the situation where this file grew up to ~24GB size. It was necessary to manually remove that file and restart ovnkube-master.
Version-Release number of selected component (if applicable):
4.8. It seems that 4.10 can hit this problem as well but latest master branch has changed so much that I am not sure if it will be possible for this to happen in 4.11.
Always (but may take very long and requires no ovnkube-master container restart)
Steps to Reproduce:
1. Let /run/ovn/ovn-nbctl.log grow for long enough
File growing without control
Log file to be eventually rotated.
 - https://github.com/openshift/cluster-network-operator/blob/release-4.8/bindata/network/ovn-kubernetes/ovnkube-master.yaml#L813
 - https://github.com/openshift/cluster-network-operator/blob/release-4.10/bindata/network/ovn-kubernetes/ovnkube-master.yaml#L750