Code review comment for ~paelzer/ubuntu/+source/dnsmasq:lp-1894619-dhcp6-use-desired-default

The tests confirmed the issue that Iain reported and that the fix works.

Old (there are many, but I picked test_wpa2_ip6):
 AssertionError: Regex didn't match:
 'inet6 2600::[0-9a-f:]+/64 scope global (?:tentative )?(?:mngtmpaddr )?(?:noprefixroute )?dynamic'

     inet6 2600::6020:9609:2ebc:7103/64 scope global temporary dynamic
                  ^^- temporary should not be here
     inet6 2600::8405:af0d:f0b3:c3a5/64 scope global mngtmpaddr noprefixroute
                  ^^- dynamic missing for this rule to match

With the new build these tests now work fine.