node: Configure route MTUs depending on destination
node: Configure route MTUs depending on destination

Configure MTU for routes such that routes to local destinations will
have MTU 65535, whereas routes to other nodes use the tunnel MTU.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@covalent.io>

tklauser/cilium,scanf/cilium,cilium/cilium,eloycoto/cilium,scanf/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,tklauser/cilium,eloycoto/cilium,scanf/cilium,cilium/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,cilium-team/cilium,eloycoto/cilium,eloycoto/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,eloycoto/cilium,eloycoto/cilium,eloycoto/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,cilium-team/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium