Make job processes keep track of their job id
Make job processes keep track of their job id

With 2.12 jobs run as separate processes. Therefore,
each process should only be in charge of a single
job. Keep track of its job id and warn if this property
is violated.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

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