module_probe: fix moudle kvm_intel/kvm_amd cannot be unloaded

Don't start vm for this case.
Signed-off-by: NPing Li <pingl@redhat.com>

generic/tests/cfg/module_probe.cfg

@@ -5,6 +5,7 @@
     # You can specify your own module list, though it is not needed usually.
     # mod_list = kvm
     load_count = 100
+    start_vm = no
     vms = ''
     profilers = ''
     take_regular_screendumps = no

generic/tests/module_probe.py

@@ -12,6 +12,11 @@ def run(test, params, env):
 
     This tests the kernel pre-installed kernel modules
     """
+    #Destory all vms for unload/load module kvm_intel/kvm_amd
+    for vm in env.get_all_vms():
+        if vm:
+            vm.destroy()
+            env.unregister_vm(vm.name)
     installer_object = base_installer.NoopInstaller('noop',
                                                     'module_probe',
                                                     test, params)