qemu.tests: Add a case migration with an ide disk doing pio operation

This case will do following steps:
  - disable dma in guest kernel command line to make sure ide disk using pio
  - check the pio and dma status inside guest
  - run iozone in background
  - do tcp migration

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
Merge pull request #188 from spcui/check_unhalt_vcpu

qemu.tests.cfg: Enable strict by "boot_strict = on" for check_unhalt_vcpu
qemu.cfg.usb: Set max nest levels of hub device to 5.

Changes from V1:
Rename device name to hub* to make it more meaningful

Signed-off-by: Feng Yang <fyang@redhat.com>
Merge pull request #197 from FengYang/usb

qemu.cfg.usb: Set max nest levels of hub device to 5.
qemu.tests.cfg: Disable pre_cmd and post_cmd for RHEL3, 4, 5, 6 guest

There is no /usr/lib/udev/rules.d in these guest.

Signed-off-by: Shuping Cui <scui@redhat.com>
Merge pull request #225 from spcui/cdrom_test_fix

qemu.tests.cfg: Disable pre_cmd and post_cmd for RHEL3, 4, 5, 6 guest
Merge pull request #119 from ypu/migrate_with_pio

qemu.tests: Add a case migration with an ide disk doing pio operation
Merge remote-tracking branch 'upstream/master'