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nixos/test-driver: log associated machine for `self.nested`
When doing `machine.succeed(...)` or something similar, it's now clear
that the command `...` was issued on `machine`.
Essentially, this results in the following diff in the log:
-(finished: waiting for unit default.target, in 13.47 seconds)
+machine: (finished: waiting for unit default.target, in 13.47 seconds)
(finished: subtest: foobar text lorem ipsum, in 13.47 seconds)