Removed unreasonable todo item from ComputeNodeTest.
Removed unreasonable todo item from ComputeNodeTest.

This dates back to a time before contexts were introduced and there was effectively a single global context. Back then each plug actually had a dirty flag, representing whether or not it had been computed for that context yet. That is no longer the case, and the idea of a flag defeats the object of multiple contexts and theaded evaluation.

GafferHQ/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,davidsminor/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,chippey/gaffer,boberfly/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,goddardl/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,cedriclaunay/gaffer,andrewkaufman/gaffer,hradec/gaffer,andrewkaufman/gaffer,ivanimanishi/gaffer,hradec/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,chippey/gaffer,goddardl/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,hradec/gaffer,davidsminor/gaffer,ivanimanishi/gaffer,hradec/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,boberfly/gaffer,GafferHQ/gaffer,goddardl/gaffer,davidsminor/gaffer,hradec/gaffer,ImageEngine/gaffer,boberfly/gaffer,cedriclaunay/gaffer,boberfly/gaffer,chippey/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,goddardl/gaffer,chippey/gaffer