qemu.tests.cfg.suspend_under_netperf: Remove netperf_stress variants

Only netperf_stress under this variants, so we can remove it to short
case name.
Signed-off-by: NFeng Yang <fyang@redhat.com>

qemu/tests/cfg/suspend_under_netperf.cfg

@@ -4,28 +4,23 @@
     type = suspend_under_stress
     services_up_timeout = 30
     kill_vm_on_error = yes
-    variants:
-        - suspend_netperf_stress:
-            #netperf server is main vm, the netperf client is the host or another vm
-            wait_bg_time = 60
-            run_bgstress = netperf_stress
-            bg_stress_run_flag = netperf_run
-            hostpassword = redhat
-            netperf_client = ${vms}
-            netperf_server = localhost
-            netperf_link = netperf-2.6.0.tar.bz2
-            server_path = /var/tmp/
-            client_path = /var/tmp/
-            netperf_test_timeout = 360
-            netperf_para_sessions = 6
-            test_protocol = TCP_STREAM
-            Windows:
-                netperf_server_link_win = "netserver-2.6.0.exe"
-                netperf_client_link_win = "netperf.exe"
-                server_path_win = "c:\\"
-                client_path_win = "c:\\"
-
-
+    wait_bg_time = 60
+    run_bgstress = netperf_stress
+    bg_stress_run_flag = netperf_run
+    hostpassword = redhat
+    netperf_client = ${vms}
+    netperf_server = localhost
+    netperf_link = netperf-2.6.0.tar.bz2
+    server_path = /var/tmp/
+    client_path = /var/tmp/
+    netperf_test_timeout = 360
+    netperf_para_sessions = 6
+    test_protocol = TCP_STREAM
+    Windows:
+        netperf_server_link_win = "netserver-2.6.0.exe"
+        netperf_client_link_win = "netperf.exe"
+        server_path_win = "c:\\"
+        client_path_win = "c:\\"
     variants:
         - guest_s3:
             no Host_RHEL.5, Host_RHEL.6.0, Host_RHEL.6.1, Host_RHEL.6.2