diagnostics: remove usage of brctl

brctl (and its bridge-utils package) has been unmaintained
for years and it's functionality replaced by the 'ip' tool
from the iproute project. brctl may not be available on
systems, and we don't need it anyway (since none of the
openshift-sdn interfaces are bridge devices) so just remove it.

Author: dcbw

pkg/oc/admin/diagnostics/diagnostics/cluster/network/in_pod/util/log.go

@@ -23,7 +23,6 @@ func (l *LogInterface) LogNode(kubeClient kclientset.Interface) {
 	l.LogSystem()
 	l.LogServices()
 
-	l.Run("brctl show", "bridges")
 	l.Run("docker ps -a", "docker-ps")
 	l.Run("ovs-ofctl -O OpenFlow13 dump-flows br0", "flows")
 	l.Run("ovs-ofctl -O OpenFlow13 show br0", "ovs-show")