runqueue: Abstract worker functionality to an object/array

With the introduction of multi-config and the possibility of distributed
builds we need arrays of workers rather than the existing two.

This refactors the code to have a dict() of workers and a dict of
fakeworkers, represented by objects. The code can iterate over these.

This is separated out from the multi-config changes since its separable
and clearer this way.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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