viriscsitest: Introduce testIscsiadmCbData struct
viriscsitest: Introduce testIscsiadmCbData struct

Some tests will want to pass their own callback data into the
testIscsiadmCbData callback. Introduce testIscsiadmCbData struct
to give this some form and order.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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