hv_reset: hv_reset function test for windows guest

Reboot guest with hv_reset flag
Signed-off-by: NYu Wang <wyu@redhat.com>

qemu/tests/cfg/hv_reset.cfg

+- hv_reset:
+    only Windows
+    type = hv_reset
+    start_vm = no
+    not_preprocess = yes
+    hv_flags = +kvm_pv_unhalt,hv_reset

qemu/tests/hv_reset.py

+from virttest import env_process
+
+
+def run(test, params, env):
+    """
+    Reboot test with hv_reset flag:
+    1) Log into a guest
+    2) Send a reboot command in guest
+    3) Wait until the guest is up again
+    4) Log into the guest to verify it's up again
+
+    :param test: QEMU test object
+    :param params: Dictionary with the test parameters
+    :param env: Dictionary with test environment.
+
+    """
+    params["cpu_model_flags"] = params["hv_flags"]
+    params["start_vm"] = "yes"
+    vm_name = params["main_vm"]
+    env_process.preprocess_vm(test, params, env, vm_name)
+    vm = env.get_vm(vm_name)
+    vm.reboot(vm.wait_for_login(timeout=360))
+    vm.verify_alive()