migration_multi_host_firewall_block: fix multiple exception
Enclose multiple exception(in one line) in parentheses.
Signed-off-by: NWei Jiangang <weijg.fnst@cn.fujitsu.com>
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Enclose multiple exception(in one line) in parentheses.
Signed-off-by: NWei Jiangang <weijg.fnst@cn.fujitsu.com>