Commit moratorium

[Julien Grall <julien@xxxxxxx>]

Hi all,

We intend to branch for Xen 4.19 in the next couple of days.

As part of the process, it is easier to branch when staging == master.
Therefore I would like to ask a commit moratorium.

Please don't commit anything (even patches released-acked) until further 
notice.
Cheers,

--
Julien Grall