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This patch changes the definition of a job and introduces per-opcode
results.

First, the result and status fields of a job are condensed into a single
'status' attribute. Then, we introduce an opcode status and one result
list, that allow jobs to return values.

The gnt-job script is also modified to allow these new fields to be
queried.

Note that the patch changes the opcode field to op_list, and it changes
its return value from string to a list of (serialized) opcodes.

Reviewed-by: ultrotter

This patch adds a very basic gnt-job script that allows job querying.
This goes on top of the previous master daemon patches.

Currently, because of the not-changed cmd lock, you can't query the jobs
as long as a job is running - you have to rm the cmd lock and then you
can query the jobs.

Reviewed-by: imsnah