Add support for iSCSI TargetAlias

[bmeagherix]

This includes both support during iSCSI LOGIN and iSNS.

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A couple of caveats...

1. checkpatch.pl

BTW, my local run of checkpatch.pl was giving a warning:

WARNING:STRLCPY: Prefer strscpy over strlcpy - see: https://github.com/KSPP/linux/issues/89
#84: FILE: iscsi-scst/usr/ctldev.c:126:
+       strlcpy(kern_attrs[i].name, ISCSI_TARGET_ALIAS_ATTR_NAME,

However, since this is in user-space code rather than kernel, strscpy is not available! I know we could have checkpatch.pl always ignore STRLCPY, but I was wary about doing that as it'd do away with the check for kernel code too.

2. Windows iSNS Server

As documented here, the Windows iSNS server doesn't handle updates very well - now including alias updates. OTOH, from https://learn.microsoft.com/en-us/windows-server/get-started/removed-deprecated-features-windows-server-2022

The iSNS Server service has now been removed from Windows Server 2022

[lnocturno]

Hi Brian,

Thank you for the patch!

Thanks,
Gleb