NM - ipv6 - teardown properly 'keep route upon reapply' tests
Change connection name to con_ipv6 so that teardown commands remove it and all associate stuff properly, fixes tests failing after 7dd48c2c merge.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Change connection name to con_ipv6 so that teardown commands remove it and all associate stuff properly, fixes tests failing after 7dd48c2c merge.