Adds support for configuring TTL, ToS/DSCP, and Path MTU Discovery
on GRE and VXLAN tunnels. TTL defaults to 64 instead of inherit to
prevent issues with routing protocols like OSPF that use TTL=1.
Refactors tunnel YANG models by merging local-remote into a unified
tunnel-common grouping for cleaner organization.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This is just a first step to add VXLAN tunnels, much more remains.
Implemented right now is as GRE, local, remote and a VNI.
Also refactor gre_basic and gre_bridged to generic tunnel tests,
the same test now tests VXLAN as well.
Basic support GRE and GRETAP tunnels both for IPv4 and IPv6.
Limited support right now, only possible to configure local
ip address and remote ip address.
Joachim Wiberg