Update the order of importing modules by PEP8.

Wrap the codes to function:
  1. Update function find_disk and rename it.
  2. Update function run_sub_test.
  3. Wrap the part of waiting plugging disks completely to
     function wait_plug_disks.
  4. Wrap the part of creating block devices to function
     create_block_devices.
  5. Wrap the part of getting block devices to function
     get_block_devices.
  6. Wrap the part of hotplug or unplug block devices to
     function plug_block_devices.
  7. Wrap the part of format windows disk to function format_disk_win.
  8. Wrap the part of doing io testing on disk to function
     run_io_test.
  9. Update function get_disk_size.
Signed-off-by: NYongxue Hong <yhong@redhat.com>

virtio_serial: Add test case for port and pci hotplug

tsc: add tsc test script for rhel8

Signed-off-by: Nyama <yama@redhat.com>

Signed-off-by: NQianqian Zhu <qizhu@redhat.com>

timedrift_adjust_time: add test results for rhel6

Move driver microsoft signature check to win_sigverif case

qemu_nobody:int object has no attribute strip 

iperf_test: Add cases to test multicast and multiqueue

x86_cpu_model: add cases to test more cpu models

Add pre_command for some memory cases to drop cache before test

Signed-off-by: NYumei Huang <yuhuang@redhat.com>

driver_load: Support ppc for loading driver

Add windows support for virtual_nic.with_stress

Numa_memdev_options: Assign proper host numa node automatically

qemu_guest_agent: update qemu-ga-win without vioser driver installed

offload_checksum_windows.py: add windows support for Offload Tx/Rx checksum

virtio_serial: Add test case for large file transfer

qemu-guest-agent: windows guest support for gagent snapshot test case 

Signed-off-by: NQianqian Zhu <qizhu@redhat.com>

virtio_port_hotplug:fix unfriendly error info

There is a unfriendly log when failed to
hotplug a port. It should give more specific
error info but no more like code error
Signed-off-by: NNana Liu <nanliu@redhat.com>

block_hotplug_in_pause: New a case that hotplug then unplug in pause

The expected results for rhel6 and rhel8 are different.
Need to add results check for rhel6.
Signed-off-by: Nyama <yama@redhat.com>

add new case aio test

aims to verify all aio tests are passed.
Signed-off-by: Nlolyu <lolyu@redhat.com>

virtio_serial_file_transfer: Support pty backend

New a case that hot plug a disk then unplug it under the status
of vm is stopping, resume vm at last.
Signed-off-by: NYongxue Hong <yhong@redhat.com>

Ping host when running heavyload stress tool
Signed-off-by: NYu Wang <wyu@redhat.com>

Since ppc doesn't support ide interface, so replace it
with virtio_scsi and virtio_blk.
Signed-off-by: Nzhenyu zhang <zhenyzha@redhat.com>

unattended_install: Workaround install windows guest with blockdev option

block_with_share_rw: New cases to test block device with share-rw

Add new case iozone_windows.with_gpt_disk

And sleep a while after host script start, to make sure host script
always start before guest script, cause for pty it must start first
Signed-off-by: NQianqian Zhu <qizhu@redhat.com>

Add new case to do iozone test for gpt format disk.
Signed-off-by: NPeixiu Hou <phou@redhat.com>

qemu_guest_agent: negative test of a nonexistent agent cmd

1.Update function "check_host_numa_node_amount" to
  "get_host_numa_node" to get host numa node
  whose node size is non-zero
2.Assign host numa nodes whose node size is non-zero to
  "host-nodes" and "target_num"
Signed-off-by: NXianwang <xianwang@redhat.com>

block_scsi_device: New a case to test scsi device

Signed-off-by: NXiaoling Gao <xiagao@redhat.com>

New cases that boot up two VMs to test scsi block device
with "share-rw=on" and "share-rw=off" option.
Signed-off-by: NYongxue Hong <yhong@redhat.com>