RE: [PATCH v0 net-next 1/1] Allow user to set metric on default route learned via Router Advertisement.

Thanks for the hint, Yeah I missed the call to rt6_add_dflt_router while 
applying patch to master branch.

I am developer of SONiC OS (https://azure.github.io/SONiC/) in LinkedIn. 
We are planning to move to IPv6 only network and I realise that IPv6 needs
capability to let administrator configure metric on default route 
learned via Router Advertisement in Linux. We support a fixed value 
1024 today in Linux.

Note for IPv4, administrator can configure metric on default route learned via
DHCPv4. 

Kindly Review the fix, this feature is useful for IPv6 and Thanks Again.