Stop special-casing the Docker bridge in Kubernetes mode

In the case targeted, Kubernetes uses a bridge named 'cbr0'.

The 'docker0' bridge should be locally-scoped in most cases, and
exceptionally users can turn that off with --probe.docker.bridge=""

prog/probe.go

@@ -266,9 +266,7 @@ func probeMain(flags probeFlags, targets []appclient.Target) {
 	}
 
 	if flags.dockerEnabled {
-		// Don't add the bridge in Kubernetes since container IPs are global and
-		// shouldn't be scoped
-		if flags.dockerBridge != "" && !flags.kubernetesEnabled {
+		if flags.dockerBridge != "" {
 			if err := report.AddLocalBridge(flags.dockerBridge); err != nil {
 				log.Errorf("Docker: problem with bridge %s: %v", flags.dockerBridge, err)
 			}