Rearrange delete-server so it always runs last.

Many tests will create servers as part of their normal operation.  We
want these to be cleaned up in one fell swoop.  By running
delete-server.go last, we accomplish this goal.
diff --git a/acceptance/09-change-admin-password.go b/07-change-admin-password.go
similarity index 100%
rename from acceptance/09-change-admin-password.go
rename to 07-change-admin-password.go
diff --git a/acceptance/07-delete-server.go b/acceptance/99-delete-server.go
similarity index 100%
rename from acceptance/07-delete-server.go
rename to acceptance/99-delete-server.go