This was because this particular code path (unlike user delete) only sent kills to root presences, for no apparent good reason.
Added regression test for this case.
This fixes http://opensimulator.org/mantis/view.php?id=6627
Also adds regression test for the case where the viewer couldn't connect with the destination region.
Also refactoring of regression test support code associated with entity transfer in order to make this test possible and the code less obscure.