multi_queues_test: fix TypeError for python3

Signed-off-by: NSitong Liu <siliu@redhat.com>

generic/tests/cfg/multi_queues_test.cfg

@@ -3,9 +3,9 @@
     no smp2
     only Linux
     only virtio_net
-    no RHEL.3, RHEL.4, RHEL.5
-    no RHEL.6.0, RHEL.6.1, RHEL.6.2, RHEL.6.3, RHEL.6.4, RHEL.6.5
-    no Host_RHEL.m5, Host_RHEL.m6
+    no RHEL.3 RHEL.4 RHEL.5
+    no RHEL.6.0 RHEL.6.1 RHEL.6.2 RHEL.6.3 RHEL.6.4 RHEL.6.5
+    no Host_RHEL.m5 Host_RHEL.m6
     type = multi_queues_test
     queues = 4
     kill_vm = yes

generic/tests/multi_queues_test.py

@@ -140,7 +140,7 @@ def run(test, params, env):
 
                 top_cmd = r"top -n 1 -p %s -b" % ",".join(map(str,
                                                               vhost_threads))
-                top_info = process.system_output(top_cmd, shell=True)
+                top_info = process.system_output(top_cmd, shell=True).decode()
                 logging.info("%s", top_info)
                 vhost_re = re.compile(r"S(\s+0.0+){2}.*vhost-\d+[\d|+]")
                 sleep_vhost_thread = len(vhost_re.findall(top_info, re.I))