Return the string representation of the dependencies of the node.

def str_deps(self):
        """Return the string representation of the dependencies of the node."""
        lines = []
        app = lines.append

        app("Dependencies of node %s:" % str(self))
        for i, dep in enumerate(self.deps):
            app("%d) %s, status=%s" % (i, dep.info, str(dep.status)))

        return "\n".join(lines)