fix typo of iozone_cmd

Change from V1:
    add .exe after iozone which is more safe.

Signed-off-by: Cong Li <coli@redhat.com>
Merge pull request #1184 from CongSmile/iozone

fix typo of iozone_cmd
virt.tests: fix no ip address for extra nics

Some guest (eg, sles, ubt) don't configure IP address for extra nics and
ping.multi_nic always failed because no IP for extra nic; fix this issue
by send pre_cmd to guest for asking IP from dhcp server before start test;

Signed-off-by: Xu Tian <xutian@redhat.com>
Merge pull request #1188 from xutian/multi_nic_ping

virt.tests: fix no ip address for extra nics
libvirt: Add test for virsh blockcopy

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