ipv6: move 'ipv6_addresses_delete_IP_moving_method_back_to_auto' to testX6
As we don't have dhcpv6 in default boxes environemnt we need to prepare a testX6 device beforehand. Fixed minor glitch in older version test too.
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As we don't have dhcpv6 in default boxes environemnt we need to prepare a testX6 device beforehand. Fixed minor glitch in older version test too.