strip content in /sys/block/md1/md/sync_action, refs #21696

tester.py

@@ -45,7 +45,7 @@ def raid_idle():
     devs = glob.glob('/sys/block/md*/md/sync_action')
     for d in devs:
         with open(d, 'r') as f:
-            sync_state = f.read()
+            sync_state = f.read().strip()
             if sync_state != "idle":
                 idle = False
                 print("State in %s is %s" % (d, sync_state))