tools/syz-testbed: produce results indefinitely

Creation of instances only at the start of the tool limits the scale of
the experiments.

Instead of setting up instances at the beginning, create, start and
stop them dynamically. This allows to conduct much larger experiments
while keeping the maximal resource consuption under control. When an
instance has been executing for the specified time, it is stopped and
replaced by another one.

Introduce two new parameters:
- max_instances - the maximal number of simultaneously running instances.
- run_hours - the lifetime (in hours) of a single instance.

The longer the tool runs, the more test results will be accumulated for
each checkout specified in the configuration file.

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