@staticmethod
    def treeRoot(treeGraph):
        inDegSeq = treeGraph.inDegreeSequence()
        root = numpy.nonzero(inDegSeq==0)[0][0]
        return root
Returns the pid for prior dnsmasq instance for a bridge/device.
dataset/ETHPy150Open charanpald/APGL/apgl/graph/GraphUtils.py/GraphUtils.treeRoot--crossover with--dataset/ETHPy150Open openstack/nova/nova/network/linux_net.py/_dnsmasq_pid_for