MFC r274804: In conf_apply() remove iSCSI ports from kernel before removing LUNs.
MFC r274804:
In conf_apply() remove iSCSI ports from kernel before removing LUNs.

Previous order confused initiators with messages about "removed" LUNs
during simple ctld restart without any real config change.  After this
commit initiators only reestablish lost connection, receive "Power on
occurred" UNIT ATTENTION status and continue normal operation.

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