qemu.tests: Correct import link for guest_suspend.py

Now guest_suspend.py is under generic/tests/ folder.
Signed-off-by: NFeng Yang <fyang@redhat.com>

qemu/tests/qemu_guest_agent_suspend.py

 import logging
 from autotest.client.shared import error
 from virttest import guest_agent
-from tests.guest_suspend import GuestSuspendBaseTest
+from generic.tests.guest_suspend import GuestSuspendBaseTest
 from qemu.tests.qemu_guest_agent import QemuGuestAgentTest
 
 

qemu/tests/timedrift_adjust_time.py

@@ -6,7 +6,7 @@ from autotest.client.shared import error
 from autotest.client.shared import utils
 from virttest import data_dir
 from virttest import env_process
-from tests.guest_suspend import GuestSuspendBaseTest
+from generic.tests.guest_suspend import GuestSuspendBaseTest
 
 
 class TimedriftTest(object):

qemu/tests/timedrift_no_net.py

@@ -4,7 +4,7 @@ from autotest.client.shared import error
 from autotest.client import utils
 from virttest import utils_test
 from virttest import utils_misc
-from tests.guest_suspend import GuestSuspendBaseTest
+from generic.tests.guest_suspend import GuestSuspendBaseTest
 
 
 class GuestSuspendSerialConsole(GuestSuspendBaseTest):

qemu/tests/timedrift_no_net_win.py

@@ -4,7 +4,7 @@ from autotest.client.shared import error
 from autotest.client import utils
 from virttest import utils_test
 from virttest import utils_misc
-from tests.guest_suspend import GuestSuspendBaseTest
+from generic.tests.guest_suspend import GuestSuspendBaseTest
 
 
 class GuestSuspendSerialConsole(GuestSuspendBaseTest):