Changed mdadm path in RAID test (refs #25198).

tests/test_raid.py

@@ -24,7 +24,7 @@ def print_green(string):
 
 
 def check_raid(dev):
-    cmd = 'mdadm -D %s' % dev
+    cmd = '/sbin/mdadm -D %s' % dev
     status, output = subprocess.getstatusoutput(cmd)
     if status != 0:
         print_red('The mdadm command on %s failed:' % dev)