Also tested "ip6= without ip=": which yakkety currently hates, but we've decided to handle separately after this SRU lands, partially because it's a trivial workaround ("for ipv6-only, specify "ip6=dhcp ip=off") and also not a case that anything needing the SRU actually does. (MAAS always specifies both, with one of them set to "off".)
Reconfirmed yakkety today.
Also tested "ip6= without ip=": which yakkety currently hates, but we've decided to handle separately after this SRU lands, partially because it's a trivial workaround ("for ipv6-only, specify "ip6=dhcp ip=off") and also not a case that anything needing the SRU actually does. (MAAS always specifies both, with one of them set to "off".)
Marking this verification-done.