schema: domain: Allow interleaving of subelements of disk's 'mirror'
schema: domain: Allow interleaving of subelements of disk's 'mirror'

While for now the 'mirror' element is output only, the idea was to allow
it to be used for input too to restore the mirror job if that becomes
the necessity. Allowing interleaving of the subelements can be done
regardless.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

jfehlig/libvirt,olafhering/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,zippy2/libvirt,zippy2/libvirt,libvirt/libvirt