usb: add hotplug test

Add a test which plugs and unplugs (virtual) usb devices.
Configured to run with the same set of devices we do
boot+reboot tests with.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

kvm/tests/usb_hotplug.py

+import logging, re, uuid
+from autotest.client.shared import error
+from autotest.client import utils
+
+@error.context_aware
+def run_usb_hotplug(test, params, env):
+    """
+    Test usb hotplug
+
+    @param test: kvm test object
+    @param params: Dictionary with the test parameters
+    @param env: Dictionary with test environment.
+    """
+
+    device = params.get("usb_type_testdev")
+    product = params.get("product")
+
+    # compose strings
+    monitor_add  = "device_add %s" % device
+    monitor_add += ",bus=usbtest.0,id=usbplugdev"
+    monitor_del  = "device_del usbplugdev"
+
+    error.context("Log into guest", logging.info)
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+    session.cmd_status("dmesg -c")
+
+    error.context("Plugin usb device", logging.info)
+    reply = vm.monitor.cmd(monitor_add)
+    if reply.find("Parameter 'driver' expects a driver name") != -1:
+        raise error.TestNAError("usb device %s not available" % device)
+
+    session.cmd_status("sleep 1")
+    session.cmd_status("udevadm settle")
+    messages_add = session.cmd("dmesg -c")
+    for line in messages_add.splitlines():
+        logging.debug("[dmesg add] %s" % line)
+    if messages_add.find("Product: %s" % product) == -1:
+        raise error.TestFail("kernel didn't detect plugin")
+
+    error.context("Unplug usb device", logging.info)
+    vm.monitor.cmd(monitor_del)
+    session.cmd_status("sleep 1")
+    messages_del = session.cmd("dmesg -c")
+    for line in messages_del.splitlines():
+        logging.debug("[dmesg del] %s" % line)
+    if messages_del.find("USB disconnect") == -1:
+        raise error.TestFail("kernel didn't detect unplug")
+
+    session.close()