srun to print jobid and jobid_set parameters used when run in verbose mode.

clear jobid from batch request unless explicitly set on command line 
  (don't use SLURM_JOBID env var). permits submitting new batch job from 
  within an existing job allocation.

src/srun/opt.c

@@ -1876,6 +1876,8 @@ static void _opt_list()
 		info("nodes          : %d %s", opt.min_nodes,
 			opt.nodes_set ? "(set)" : "(default)");
 	}
+	info("jobid          : %u %s", opt.jobid, 
+		opt.jobid_set ? "(set)" : "(default)");
 	info("partition      : %s",
 		opt.partition == NULL ? "default" : opt.partition);
 	info("job name       : `%s'", opt.job_name);

src/srun/srun.c

@@ -460,8 +460,8 @@ _run_batch_job(void)
 
 	/* Do not re-use existing job id from environment variable
 	 * when submitting new job from within a running job */
-	if (opt.jobid_set != NO_VAL)
-		req->job_id = (uint32_t)opt.jobid;
+	if (!opt.jobid_set)
+		req->job_id = NO_VAL;
 
 	retries = 0;
 	while (  (retries < MAX_RETRIES)