git: add config file telling git-publish how to send patches
git: add config file telling git-publish how to send patches

The "git-publish" tool is a useful git extension for sending patch
series for code review. It automatically creates versioned tags
each time code on a branch is sent, so that there is a record of
each version. It also remembers the cover letter so it does not
need re-entering each time the series is reposted.

With this config file present it is now sufficient[1] to run

  $ git publish

to send all patches in a branch to the list for review, with the
correct subject prefix added for this non-core libvirt module.

[1] Assuming your $HOME/.gitconfig has an SMTP server listed
at least e.g.

   [sendemail]
        smtpserver = smtp.example.com

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go