[j-nsp] Prefix independent convergence and FIB backup path

[Pavel Lunin]

Here (VPNv4/v6, BGP PIC Core + PIC Edge, no addpath as not supported in vpn
> AFI) we can see that, when possible:
>


No need for add-path in a VRF in fact. You always had it "for free" with
per PE route-distinguishers.