vagrant ipv6: do not modify gateway mtu
vagrant ipv6: do not modify gateway mtu

Signed-off-by: samuel.elias <d838d617616898a9102a976288eaa6f77e3e0c67@cisco.com>

rastislavszabo/vpp,rastislavszabo/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp