The attached debdiffs lp1609898-nm-[trusty|xenial|yakkety].debdiff patch network-manager's debian/tests/wpa-dhclient test to use /128 instead of /64 for its DHCPv6 address test.
Note it leaves the ipv6 Router Advertisement provided addresses with /64, as that prefix length is provided to the client (unlike DHCPv6) in the RA messages.
The attached debdiffs lp1609898- nm-[trusty| xenial| yakkety] .debdiff patch network-manager's debian/ tests/wpa- dhclient test to use /128 instead of /64 for its DHCPv6 address test.
Note it leaves the ipv6 Router Advertisement provided addresses with /64, as that prefix length is provided to the client (unlike DHCPv6) in the RA messages.