conf: Check for duplicate authdef during hostdev iSCSI processing
conf: Check for duplicate authdef during hostdev iSCSI processing

If virDomainHostdevSubsysSCSIiSCSIDefParseXML processing finds a
duplicated <auth> structure, we should error out rather than continue.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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