Slaves need to know if they are collocated and what files have moved.

def configure_node(self, node):
        """Slaves need to know if they are collocated and what files have moved."""

        node.slaveinput['cov_master_host'] = socket.gethostname()
        node.slaveinput['cov_master_topdir'] = self.topdir
        node.slaveinput['cov_master_rsync_roots'] = [str(root) for root in node.nodemanager.roots]