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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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.