Fix backend.Executioner unit test.

Before the patch that allows to create unshared instances of Connectible
objects, all Connection object were deleted at once in destroy_context().
It made sense at the time, because there was always at most one Connection
per Connectible subclass and Connectible.disconnect() was called only
internally by the Executioner class. Now that we can make arbitrary
connections, it makes more sense to delete the Connection object when
Connectible.disconnect() is called.

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