qemuDomainObjBeginNestedJob: Return -2 for temporary failures
If job queue is full or waiting for a job times out, the function
returns -2 so that it can be handled in a different way by callers.
The change is safe since all existing callers of
qemuDomainObjBeginNestedJob check the return value to be less than zero.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
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