virttest.iscsi: Ignore status for some command

In iscsi class we use some command to check the status of iscsi,
this kind of command can failed during execution. So set the
ignore_status to True for them.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
virttest.qemu_storage: Fix the wrong use of super

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
cfg: Replace humanmonitor1 with hmp1

As we've been using the shorthand 'hmp1' now.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>