IPv6- samples on OSPFv3 configuration Apps.

Third batch of apps for this "IPv6-only week".  Five sample apps to configure IGP routing for IPv6 using OSPFv3. Samples include both single-area and inter-area configurations:

• nc-create-xr-ipv6-ospfv3-cfg-20-ydk.py - single-area IPv6 routing
• nc-create-xr-ipv6-ospfv3-cfg-30-ydk.py - IPv6 ABR
• nc-create-xr-ipv6-ospfv3-cfg-32-ydk.py - IPv6 ABR with stub area
• nc-create-xr-ipv6-ospfv3-cfg-34-ydk.py - IPv6 ABR with totally stub area
• nc-delete-xr-ipv6-ospfv3-cfg-20-ydk.py - delete all OSPFv3 configuration 

With this set of apps, we have a pretty good set of routing examples for IPv6:

IPv6 static routing

IPv6 BGP

IPv6 IS-IS

IPV6 OSPFv3 

As usual, you will find four boilerplate samples you can use to start implementing apps based on the CRUD service:

• nc-create-xr-ipv6-ospfv3-cfg-10-ydk.py - create boilerplate
• nc-read-xr-ipv6-ospfv3-cfg-10-ydk.py - read boilerplate
• nc-update-xr-ipv6-ospfv3-cfg-10-ydk.py - update boilerplate
• nc-delete-xr-ipv6-ospfv3-cfg-10-ydk.py - delete boilerplate