conf: fix cannot start a guest have a shareable network iscsi hostdev
conf: fix cannot start a guest have a shareable network iscsi hostdev

https://bugzilla.redhat.com/show_bug.cgi?id=1174569

There's nothing we need to do for shared iSCSI devices in
qemuAddSharedHostdev and qemuRemoveSharedHostdev. The iSCSI layer
takes care about that for us.

Signed-off-by: Luyao Huang <23d9981432efa88691fd2a71f5525bc2174f7664@redhat.com>
Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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