tp-qemu.tests.drive_mirror: remove invalid test case

source image and dest image are different before execute
block-job-reopen, that is expect. If recorrect test step
it will be duplicate with block-job-complete test. so
drop this case.
Signed-off-by: NXu Tian <xutian@redhat.com>

qemu/tests/cfg/drive_mirror.cfg

@@ -79,12 +79,6 @@
                                    initiator_target = "iqn.2010-07.test.org:kvmautotest"
                                    target_target = "iqn.2001-05.com.equallogic:0-8a0906-db31f7d03-470263b05654c204-kvm-test"
                                    # End
-                        - continuous_backup:
-                           type = drive_mirror_continuous_backup
-                           clean_cmd = "rm -f tmp*.file"
-                           dd_cmd = "dd if=/dev/zero bs=1024 count=1024 of=tmp%s.file"
-                           Windows:
-                               clean_cmd = "del /F tmp*.file"
                 - negative_test:
                     negative_test = yes
                     variants:

qemu/tests/drive_mirror_continuous_backup.py

-import logging
-import time
-
-from autotest.client.shared import error
-from autotest.client.shared import utils
-
-from virttest import qemu_storage
-from virttest import data_dir
-
-from qemu.tests import drive_mirror
-
-
-@error.context_aware
-def run(test, params, env):
-    """
-    1) Synchronize disk and then do continuous backup
-
-    "qemu-img compare" is used to verify disk is mirrored successfully.
-    """
-    tag = params.get("source_images", "image1")
-    qemu_img = qemu_storage.QemuImg(params, data_dir.get_data_dir(), tag)
-    mirror_test = drive_mirror.DriveMirror(test, params, env, tag)
-    tmp_dir = params.get("tmp_dir", "c:\\")
-    clean_cmd = params.get("clean_cmd", "del /f /s /q tmp*.file")
-    dd_cmd = "dd if=/dev/zero bs=1024 count=1024 of=tmp%s.file"
-    dd_cmd = params.get("dd_cmd", dd_cmd)
-    try:
-        source_image = mirror_test.get_image_file()
-        target_image = mirror_test.get_target_image()
-        error.context("start mirror block device", logging.info)
-        mirror_test.start()
-        error.context("Wait mirror job in steady status", logging.info)
-        mirror_test.wait_for_steady()
-        error.context("Testing continuous backup", logging.info)
-        session = mirror_test.get_session()
-        error.context("Continuous create file in guest", logging.info)
-        session.cmd("cd %s" % tmp_dir)
-        for fn in range(0, 128):
-            session.cmd(dd_cmd % fn)
-        error.context("pause vm and sync host cache", logging.info)
-        time.sleep(3)
-        mirror_test.vm.pause()
-        utils.system("sync")
-        time.sleep(3)
-        error.context("Compare original and backup images", logging.info)
-        qemu_img.compare_images(source_image, target_image)
-        mirror_test.vm.resume()
-        session = mirror_test.get_session()
-        session.cmd("cd %s" % tmp_dir)
-        session.cmd(clean_cmd)
-        mirror_test.vm.destroy()
-    finally:
-        mirror_test.clean()