APPLIED[B, X]: [Xenial Regression SRU] Fix "Cannot set MTU higher than 1500 in Xen instance"

[Stefan Bader]

On 12.07.2018 16:50, Stefan Bader wrote:
> BugLink: https://bugs.launchpad.net/bugs/1781413
> 
> The latest Xenial update has broken MTU functionality in Xen: specifically,
> setting MTUs larger than 1500 fails. This prevents Jumbo Frames and other
> features which require larger than 1500 byte MTUs from being used. This can
> lead to a failure to sync/connect to other components in the cluster/cloud
> which expect higher MTUs and result in unavailable services.
> 
> The fix is to cherry-pick 2 patches from upstream. I have not searched to
> deeply but those seem not pending on upstream stable.
> 
> -Stefan
> 
> 
For completeness, those patches got applied to Bionic and Xenial re-spins.

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