conf: Pass 'flags' to virDomainDiskSourceFormat in virDomainDiskDefFormatMirror
conf: Pass 'flags' to virDomainDiskSourceFormat in virDomainDiskDefFormatMirror

We have the proper flags available so we can pass them to the fomatter.
The added bonus is that private data may be formatted into the status
XML.

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

nertpinx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,zippy2/libvirt,zippy2/libvirt,eskultety/libvirt,olafhering/libvirt,crobinso/libvirt,nertpinx/libvirt,nertpinx/libvirt,olafhering/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,eskultety/libvirt,jardasgit/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,jfehlig/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,andreabolognani/libvirt,olafhering/libvirt,jardasgit/libvirt