gitpublish: add a subject prefix

Now that we removed the subject prefix tag from the mailman config
we should set 'libvirt' as the subject when sending patches.

Reviewed-by: Ján Tomko <[email protected]>
Signed-off-by: Daniel P. Berrangé <[email protected]>

Author: berrange

.gitpublish

@@ -1,3 +1,4 @@
 [gitpublishprofile "default"]
 base = master
 to = [email protected]
+prefix = libvirt PATCH