virttest.utils_test: Remove duplicate parameter in start_suspend

We use supend_cmd and suspend_start_cmd together for same command.
So just remove supend_cmd parameter.

Signed-off-by: Feng Yang <fyang@redhat.com>
qemu.tests: Update sr_iov_hotplug to support sub test after hotpulg

Signed-off-by: Feng Yang <fyang@redhat.com>
qemu.cfg: Add more sr_iov test cases

Signed-off-by: Feng Yang <fyang@redhat.com>
virttest.test_setup: Add more logs during vf/pf setting up.

Log dmesg after loading sr-iov driver.
Log vf number in host.

Signed-off-by: Feng Yang <fyang@redhat.com>
qemu.tests.sr_iov_hotplug: Make sure new hotpulged nic works.

First check that new hotpulged nic could get ip.
Then try to access network with it.
Disable the primary link(s) of guest before hotpulg.

Signed-off-by: Feng Yang <fyang@redhat.com>