libvirt-test/pci_passthrough: Add a case in pcipassthrough to test SRIOV.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Merge pull request #53 from yangdongsheng/pci_passthrough

libvirt-test/sr-iov: Add a case in pcipassthrough to test SRIOV...
Add the missing 'allocation' param

Signed-off-by: Yanbing Du <ydu@redhat.com>
Merge pull request #85 from will-Do/param_fix

Add the missing 'allocation' param
libvirt.tests: Add test for iface related commands

Signed-off-by: Yanbing Du <ydu@redhat.com>