1. move function to parent class for reducing repetitive code.
2. correct the snapshot tag to get the right guest_file_name
for windows guest.
3. add case to change block interface for snapshot
Signed-off-by: NPing Li <pingl@redhat.com>

qemu.tests.balloon_stress: fix session unavailable problem.

1. Using framework function get_guest_cmd_status_output() to execute cmd in guest,
in case session is unavailable sometimes.
2. close session when test finished.
Signed-off-by: NCong Li <coli@redhat.com>

Remove set_winutils_letter from rng_bat

it has been supported upstream
Signed-off-by: NSuqin Huang <shuang@redhat.com>

balloon_stress:default maximum balloon value correct and test logic optmize

balloon_stress:
1.set default maximum balloon value--vm maximum mem
2.set memory balloon randomly, not constant value.
3.consider case:balloon_in_use call

Signed-off-by: Aihua Liang<aliang@redhat.com>

Add balloon_illegal test in balloon_check

qemu.tests.block_stream: Add case for reset negative speed during blo…

qemu.tests.balloon_check:
1.Optimize minimum ballooned size for windows guest
2.Optimize illegal test for windows guest
3.Seperate illegal as an individual cfg file
4.Compare windows guest's used memory for balloon check.
5.add function get_used_mem
6.modify the log info

qemu.tests.balloon_service:
1.Optimize code for balloon_service test.

qemu.tests.cfg.balloon_illegal:
1.add new cfg "balloon_illegal.cfg".
2.Adjust code for balloon_illegal test
3.Optimize code for windows's minimum balloon size

qemu.tests.cfg.balloon_service:
1.Set ratio to 0.1

qemu.tests.cfg.balloon_check:
1.Set ratio to 0.1
Signed-off-by: NAihua Liang <aliang@redhat.com>

Add negative case for subcommand rebase of qemu-img

qemu.tests: use snapshot to avoid backup and retore steps

qemu.tests.block_stream.with_stress.cancel_async: Update case steps.

Signed-off-by: NCong Li <coli@redhat.com>

Add rng-egd backend to rng1

Signed-off-by: NSuqin Huang <shuang@redhat.com>

qemu.tests.win_virtio_driver_update_test: fix dirve_format issue

Need wait for block stream finished when streaming.
Signed-off-by: NCong Li <coli@redhat.com>

add windows guest agent installation method

Rebase an image to the other image to check whether cause core dump.
All the images are created on the iscsi lvm.

Signed-off-by: Ping Li pingl@redhat.com

tp-qemu.multi_queues_test: fix vcpus count

Merge pull request #773 from XueqiangWei/migration_multi_host_ping_pong_until_guest_kdump_completed_

qemu.test: migration_multi_host_with_kdump

Force ide drive_format  make create VM failed if VM is Q35 machine,
fix it by overwrite dirve_format to ahci if machine type is q35.
Signed-off-by: NXu Tian <xutian@redhat.com>

Add cases for subcommand rebase of qemu-img

used postfix '_fixed' for params vcpu threads,
cores and sockets to avoid these params overwrite
in other configuration file.
Signed-off-by: NXu Tian <xutian@redhat.com>

enable snapshot for disk image, and commit changes when OS updated.
so that we can skip logical about backup and restore OS.
Signed-off-by: NXu Tian <xutian@redhat.com>

qemu.tests.multi_disk_random_hotplug: fix syntax

need higher version package kmod to update kernel

qemu.tests.netkvm_in_use: Update some commands for checking pci.

generic.tests.jumbo: update test steps.

1. add function "start_worker_guest_kdump"
2. add function "check_worker_kdump"
Signed-off-by: NXueqiang Wei <xuwei@redhat.com>

qemu.test: multihost migration with xbzrle

qemu.tests: Downgrade the image version when it is QCOW v3 

numa.numa_stress: remove memoryfile to release memory

tp-qemu: remove useless config in host-kernel.cfg

nettype setting in host-kernel.cfg blocked macvtap related
test loop.
Signed-off-by: NXu Tian <xutian@redhat.com>

Signed-off-by: NWei Liao <weliao@redhat.com>