Changed 'json' to 'JSON'

Change-Id: Idac5c4850f8bb727e17967532ab0b9b9c8e99068
Some edits for help strings

Some edits for neutron help strings as noticed by Lana during review of
this patch:
https://review.openstack.org/#/c/102900/

Change-Id: I4f6cbb3ced85e15c5f4f716aad630090955de31b
Co-Authored-By: Lana Brindley <openstack@lanabrindley.com>
Create new IPv6 attributes for Subnets by client

This is the client implementation of bp ipv6-two-attributes.
Add two optional arguments:
 --ipv6-ra-mode
 --ipv6-address-mode

Partially implements bp ipv6-two-attributes

Change-Id: Ia922a9b6bb4e1dbd372174d48f29f5411c7b5674
Merge "Changed 'json' to 'JSON'"
Merge "Some edits for help strings"
Merge "Create new IPv6 attributes for Subnets by client"