neutron allows creating IPV6 floating ip

Despite of https://bugs.launchpad.net/neutron/+bug/1323766, neutron creates floating IPV6 and associates
it to the tenant network IPV6.

To reproduce:
neutron floatingip-list
+--------------------------------------+------------------+---------------------+---------+
| id | fixed_ip_address | floating_ip_address | port_id |
+--------------------------------------+------------------+---------------------+---------+
| ba8f4339-dbb2-4678-a111-1e2d7f63a0b9 | | 2005::3 | |
+--------------------------------------+------------------+---------------------+---------+
797:devstack> neutron port-list
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------------------+
| 0bcd1967-e462-4947-a9b3-3b0e1bb159f8 | | fa:16:3e:93:29:ba | {"subnet_id": "9a5a6e03-255f-42db-8b56-955d50ec973b", "ip_address": "2005::2"} |
| 1f7eaac2-c5e6-481a-b98e-ace276fa581a | | fa:16:3e:aa:20:db | {"subnet_id": "62f2f8e9-e997-47e1-b5c6-5fa888b270e9", "ip_address": "feee::2"} |
| 713f57e8-df16-49bf-97fd-b41bd505de10 | | fa:16:3e:40:78:2e | {"subnet_id": "62f2f8e9-e997-47e1-b5c6-5fa888b270e9", "ip_address": "feee::1"} |
| d57165ea-f0a8-4d13-9fbf-5a2872887b38 | | fa:16:3e:c9:b6:df | {"subnet_id": "9a5a6e03-255f-42db-8b56-955d50ec973b", "ip_address": "2005::3"} |
| d6c391f1-c199-4846-aebd-a948877f7f57 | | fa:16:3e:d4:1f:b4 | {"subnet_id": "62f2f8e9-e997-47e1-b5c6-5fa888b270e9", "ip_address": "feee::f816:3eff:fed4:1fb4"} |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------------------+
798:devstack> neutron floatingip-associate ba8f4339-dbb2-4678-a111-1e2d7f63a0b9 d6c391f1-c199-4846-aebd-a948877f7f57
Associated floating IP ba8f4339-dbb2-4678-a111-1e2d7f63a0b9

Expected behavior: fail association and print the error message

Moreover, it's possible to create floating IPv4 and associate it to tenant IPV6