[Cake] allocate_src allocate_dst

[Kevin Darbyshire-Bryant]

> On 25 Nov 2017, at 15:19, Jonathan Morton <chromatix99 at gmail.com> wrote:
> 
> I think I originally intended to make them individually conditional on the src/dest host flags, but that idea evidently got forgotten.
> 
> - Jonathan Morton

Ahh, is this https://github.com/ldir-EDB0/sch_cake/commit/53953e073e26c45ac67dd5677340a74f75a6e1ae more what you were thinking Jonathan?

It compiles… family using network so not yet dared run it ;-)