500vlans: speedup the test and fix dhcp lease time
DHCP lease was set to 2mins and was expiring during upping more and more vlans. This is now changed to 10m. The test was reworked a bit to be much quicker.
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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.
DHCP lease was set to 2mins and was expiring during upping more and more vlans. This is now changed to 10m. The test was reworked a bit to be much quicker.