Qemu Test: Create a separated script for usb device

These code existed in boot.py before. But it's better
to put them in a new separated file.
Signed-off-by: NQingtang Zhou <qzhou@redhat.com>

qemu/tests/cfg/usb.cfg

@@ -79,11 +79,11 @@
     # usb tests
     variants:
         - usb_boot:
-            type = boot
+            type = usb_basic_check
             usb_devices += " testdev"
             check_func = "check_usb_device"
         - usb_reboot:
-            type = boot
+            type = usb_basic_check
             reboot_method = shell
             usb_devices += " testdev"
             check_func = "check_usb_device"

qemu/tests/usb_basic_check.py

+import time, re, logging
+from autotest.client.shared import error
+
+
+def check_usb_device(test, params, env):
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+
+    o = vm.monitor.info("usb")
+    if isinstance(o, dict):
+        o = o.get("return")
+    info_usb_name = params.get("info_usb_name")
+    if info_usb_name and (info_usb_name not in o):
+        raise error.TestFail("Could not find '%s' device, monitor "
+                             "returns: \n%s" % (params.get("product"), o))
+
+    timeout = float(params.get("login_timeout", 240))
+    session = vm.wait_for_login(timeout=timeout)
+
+    chk_list = ["%s:%s" % (params.get("vendor_id"), params.get("product_id"))]
+    if params.get("vendor"):
+        chk_list.append(params.get("vendor"))
+    if params.get("product"):
+        chk_list.append(params.get("product"))
+
+    o = session.cmd("lsusb -v")
+    for item in chk_list:
+        if not re.findall(item, o):
+            raise error.TestFail("Could not find item '%s' in guest, "
+                                 "'lsusb -v' output:\n %s" % (item, o))
+
+
+@error.context_aware
+def run_usb_basic_check(test, params, env):
+    """
+    KVM usb_basic_check test:
+    1) Log into a guest
+    2) Verify device(s) work well in guest (optional)
+    3) Send a reboot command or a system_reset monitor command (optional)
+    4) Wait until the guest is up again
+    5) Log into the guest to verify it's up again
+    6) Verify device(s) again after guest reboot (optional)
+
+    @param test: kvm test object
+    @param params: Dictionary with the test parameters
+    @param env: Dictionary with test environment.
+    """
+
+    def _check_dev():
+        try:
+            check_usb_device(test, params, env)
+        except Exception:
+            session.close()
+            raise
+
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    timeout = float(params.get("login_timeout", 240))
+    error.context("Try to log into guest.", logging.info)
+    session = vm.wait_for_login(timeout=timeout)
+
+    error.context("Verify device(s) before rebooting.")
+    _check_dev()
+
+    if params.get("reboot_method"):
+        error.context("Reboot guest.")
+        if params["reboot_method"] == "system_reset":
+            time.sleep(int(params.get("sleep_before_reset", 10)))
+        session = vm.reboot(session, params["reboot_method"], 0, timeout)
+
+        error.context("Verify device(s) after rebooting.")
+        _check_dev()
+
+    session.close()