[PATCH stable] Set a large MTU on ovs-created tunnel devices

[Dan Streetman]

Can you queue up these commits for stable?

commit 72564b59ffc438ea103b0727a921aaddce766728
Author: David Wragg <david@weave.works>
Date:   Wed Feb 10 00:05:55 2016 +0000

    vxlan: Relax MTU constraints


commit 55e5bfb53cff286c1c1ff49f51325dc15c7fea63
Author: David Wragg <david@weave.works>
Date:   Wed Feb 10 00:05:57 2016 +0000

    geneve: Relax MTU constraints


commit 7e059158d57b79159eaf1f504825d19866ef2c42
Author: David Wragg <david@weave.works>
Date:   Wed Feb 10 00:05:58 2016 +0000

    vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices