conf: Report alias name of the detached device in error
conf: Report alias name of the detached device in error

This is v2 from:
https://listman.redhat.com/archives/libvir-list/2021-May/msg00481.html

I have reworked the code a bit to have only one error report
instead of multiple ones with different combinations of possible
matching items. Suggested by Laine.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1942367

Signed-off-by: Kristina Hanicova <e70d889c982bbe3b9ce2841af457ca911bff1baa@redhat.com>
Reviewed-by: Laine Stump <c23361c43fbf79fed83e8b76173707b083d6caf5@redhat.com>

libvirt/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,olafhering/libvirt,olafhering/libvirt,olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,nertpinx/libvirt,crobinso/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,nertpinx/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,zippy2/libvirt