iscsiadm: fix discovery record use

iscsiadm is not using the discovery record settings. This has
iscsiadm -m discovery -t st -p ip:port
search for a discovery setting for ip:port. If found it will
use those values for discovery. Previously it would always
use the iscsid.conf settings.

To change the discovery settings for a record you can do
iscsiadm -m discovery -p ip:port -o update -n setting_name -v value
like in node mode.

Or you can completely remove the discovery record and targets found
through it by doing
iscsiadm -m discovery -p ip:port -o delete
then run the discovery command which will then use the iscsid.conf
values and create a new discovery record.

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