virsh_migrate_multi_vms: SKIP if srcuri and desturi not defined

Issue #1014, SKIP this test if we haven't adjusted the cfg to have
real source and destination URI's
qemu.test: Not create test file when it is not necessary

Not create test file when it is not necessary

Signed-off-by: Yunping Zheng <yunzheng@redhat.com>
qemu.tests.cfg: add remove_image_stg for usb_storage

need to remove the origin image and create a new image for format_disk
when running every usb_storage subcase.

Signed-off-by: Shuping Cui <scui@redhat.com>
Merge pull request #1238 from jferlan/virsh_migrate_multi_vms

virsh_migrate_multi_vms: SKIP if srcuri and desturi not defined
Merge pull request #1263 from spcui/usb_storage_fix

qemu.tests.cfg: add remove_image_stg for usb_storage
qemu_vm, aexpect, utils_misc: attempt to catch qemu in defunct state.

Add support to detect if qemu becomes <defunct> (zombie)
after it was started. If qemu is detected defunct, it will
raise virt_vm.VMStartError().

Signed-off-by: Ruda Moura <rmoura@redhat.com>
Fix backport bug -> Rename json to simplejson

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Fix undefined variable bug introduced in 10c60b61

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1267 from autotest/fix-backport-bug

Fix backport bug
Merge pull request #1255 from ruda/qemu-defunct

qemu_vm, aexpect, utils_misc: attempt to catch qemu in defunct state.
Merge pull request #1262 from humanux/virtual_nic_send_buffer

qemu.test: Not create test file when it is not necessary
staging.backports.simplejson: Use all relative imports

Due to the import structure of the staging module, in
order to make importing the simplejson module possible
in systems without python-simplejson installed already,
use only relative imports. This will avoid the error

ImportError: No module named simplejson.scanner

Found by jferlan.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1268 from autotest/fix-import-problem

staging.backports.simplejson: Use all relative imports