Deletes a vrrp instance from an interface

        Note:
            This method will attempt to delete the vrrp from the node's
            operational config. If the vrrp does not exist on the
            interface then this method will not perform any changes
            but still return True

        Args:
            interface (string): The interface to configure.
            vrid (integer): The vrid number for the vrrp to be deleted.

        Returns:
            True if the vrrp could be deleted otherwise False (see Node)

def delete(self, interface, vrid):
        """Deletes a vrrp instance from an interface

        Note:
            This method will attempt to delete the vrrp from the node's
            operational config. If the vrrp does not exist on the
            interface then this method will not perform any changes
            but still return True

        Args:
            interface (string): The interface to configure.
            vrid (integer): The vrid number for the vrrp to be deleted.

        Returns:
            True if the vrrp could be deleted otherwise False (see Node)

        """

        vrrp_str = "no vrrp %d" % vrid
        return self.configure_interface(interface, vrrp_str)