Sometimes container.cleanup() can be called from multiple paths for the same container during error conditions from monitor and regular startup path. So if the container network has been already released do not try to release it again. Signed-off-by: Jana Radhakrishnan <mrjana@docker.com> Upstream-commit: 6cdf8623d52e7e4c5b5265deb5f5b1d33f2e6e95 Component: engine