False positiv error when cleaning upp conntrack for UDP endpoints

[roffe]

Observed

E0213 10:12:03.403010       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.1.19:53 due to exit status 1
E0213 10:12:03.411239       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.1.19:53 due to exit status 1
E0213 10:12:03.433104       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.2.121:53 due to exit status 1
E0213 10:12:03.438133       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.2.121:53 due to exit status 1
E0213 10:12:03.443904       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.2.121:53 due to exit status 1
E0213 10:12:03.449875       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.1.19:53 due to exit status 1
E0213 10:12:03.484576       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.4.254:53 due to exit status 1
E0213 10:12:03.491458       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.4.254:53 due to exit status 1
E0213 10:12:03.497347       1 network_services_controller.go:626] Failed to delete conntrack entry for endpoint: 10.32.4.254:53 due to exit status 1

in my logs today

The error is triggered due to conntrack exiting with non zero exit code and printing to stderr when deleting 0 flows. https://github.com/cloudnativelabs/kube-router/blob/master/app/controllers/network_services_controller.go#L618

Working on a fix as we speak and should be done within a hour or two