slurm2sql: Don't use WAL mode by default

- Has problems when it's not run on one node, which is often on
  clusters

Author: rkdarst

slurm2sql.py

@@ -895,7 +895,7 @@ def infer_type(cd):
                'sum(TotDiskRead) as TotDiskRead, '
                'sum(TotDiskWrite) as TotDiskWrite '
                'FROM slurm GROUP BY JobIDnostep')
-    db.execute('PRAGMA journal_mode = WAL;')
+    #db.execute('PRAGMA journal_mode = WAL;')
     db.commit()
     c = db.cursor()