qemu.cfg.suspend_under_netperf: Set test_option to -- -b 10 -D

Signed-off-by: NFeng Yang <fyang@redhat.com>

qemu/tests/cfg/suspend_under_netperf.cfg

@@ -13,9 +13,10 @@
     netperf_link = netperf-2.6.0.tar.bz2
     server_path = /var/tmp/
     client_path = /var/tmp/
-    netperf_test_timeout = 360
+    netperf_test_timeout = 600
     netperf_para_sessions = 6
     test_protocols = TCP_STREAM
+    test_option = -- -b 10 -D
     Windows:
         netperf_server_link_win = "netserver-2.6.0.exe"
         netperf_client_link_win = "netperf.exe"