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[Summary]
can update the gateway of ipv6 subnet with ipv6 address which has a leading "0" via cli

[Topo]
devstack all-in-one node

[Description and expect result]
if update the gateway of ipv6 subnet with ipv6 address which has a leading "0",
 should reject leading '0's to avoid ambiguity.

[Reproduceable or not]
reproduceable 

[Recreate Steps]
1) create 1 ipv6 subnet:
root@45-59:/opt/stack/devstack# neutron subnet-create net11 2::1/64 
--ip-version 6 --name sub11
Created a new subnet:
+-------------------+----------------------------------------------------+
| Field             | Value                                              |
+-------------------+----------------------------------------------------+
| allocation_pools  | {"start": "2::2", "end": "2::ffff:ffff:ffff:ffff"} |
| cidr              | 2::/64                                             |
| dns_nameservers   |                                                    |
| enable_dhcp       | True                                               |
| gateway_ip        | 2::1                                               |
| host_routes       |                                                    |
| id                | e2a09fa2-52ce-4f68-9619-b635529213d0               |
| ip_version        | 6                                                  |
| ipv6_address_mode |                                                    |
| ipv6_ra_mode      |                                                    |
| name              | sub11                                              |
| network_id        | af909be2-5413-40a0-984f-cd58dc7289c9               |
| subnetpool_id     |                                                    |
| tenant_id         | bc125faaf00041f492eaf10f72a37c2d                   |
+-------------------+----------------------------------------------------+
root@45-59:/opt/stack/devstack# 


2)update the gateway of subnet with needless "0" in the ip address:
root@45-59:/opt/stack/devstack# neutron subnet-update --gateway 2::0001 sub11
Updated subnet: sub11
root@45-59:/opt/stack/devstack#
root@45-59:/opt/stack/devstack# neutron subnet-show sub11
+-------------------+----------------------------------------------------+
| Field             | Value                                              |
+-------------------+----------------------------------------------------+
| allocation_pools  | {"start": "2::2", "end": "2::ffff:ffff:ffff:ffff"} |
| cidr              | 2::/64                                             |
| dns_nameservers   |                                                    |
| enable_dhcp       | True                                               |
| gateway_ip        | 2::0001    >>>ISSUE                                        |
| host_routes       |                                                    |
| id                | e2a09fa2-52ce-4f68-9619-b635529213d0               |
| ip_version        | 6                                                  |
| ipv6_address_mode |                                                    |
| ipv6_ra_mode      |                                                    |
| name              | sub11                                              |
| network_id        | af909be2-5413-40a0-984f-cd58dc7289c9               |
| subnetpool_id     |                                                    |
| tenant_id         | bc125faaf00041f492eaf10f72a37c2d                   |
+-------------------+----------------------------------------------------+


3) if update the gateway of ipv6 subnet with ipv6 address which has a leading
 "0" via dashboard, no this issue

4) For reference, below is the occurence of updating gateway of ipv4 subnet:
root@45-59:/opt/stack/devstack# neutron subnet-update --gateway 1.0.0.001 sub1 
Invalid input for gateway_ip. Reason: '1.0.0.001' is not an accepted IP address,
 '1.0.0.1' is recommended.
root@45-59:/opt/stack/devstack# 


[Configration]
reproduceable bug, no need

[logs]
reproduceable bug, no need

[Root cause anlyze or debug inf]
reproduceable bug

[Attachment]
None

** Affects: neutron
     Importance: Undecided
     Assignee: Reedip (reedip-banerjee)
         Status: New

-- 
can update the gateway of ipv6 subnet with ipv6 address which has a leading "0" via cli
https://bugs.launchpad.net/bugs/1531103
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