bin/50208: iscsi-target prints scary messages

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         50208
>Category:       bin
>Synopsis:       iscsi-target prints scary messages
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 04 15:25:00 +0000 2015
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date 2015.09.04.07.38.05
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

Now that PR 49616 is fixed, I figured I'd try to create a minimal
automated iSCSI test.

I was able to successfully export an iSCSI target and attach it to an
initiator running on the same machine, and this successfully attached
a new sd device that appears to work.  However, iscsi-target logged
some messages on the console that leave me less than confident that
everything is actually working correctly.

This problem is not new; I tried running the same test against
-current sources from early 2011 with the same result.

>How-To-Repeat:

On a machine that is not already using iSCSI and has a non-empty
hostname, execute the following as root in a Bourne shell:

   # Start target with default configuration from /etc/iscsi/targets
   iscsi-target
   # Wait for target to start
   sleep 5

   # Start initiator per example in iscsictl(8)
   modload iscsi
   modstat iscsi
   iscsid
   iscsictl add_send_target -a localhost
   iscsictl refresh_targets
   iscsictl list_targets
   iscsictl login -P 2
   # Wait for any new messages to appear in /var/log/messages
   sleep 5
   grep 'iscsi.*ERROR' /var/log/messages

This will show messages like the following:

   Sep  4 15:15:33 foo iscsi-target: pid 1607:/tmp/bracket/build/2015.09.04.07.38.05-i386/src/external/bsd/iscsi/lib/../dist/src/lib/target.c:1223: ***ERROR*** CmdSN
   Sep  4 15:15:33 foo iscsi-target: pid 1607:/tmp/bracket/build/2015.09.04.07.38.05-i386/src/external/bsd/iscsi/lib/../dist/src/lib/target.c:1388: ***ERROR*** logout_command_t() failed 
   Sep  4 15:15:33 foo iscsi-target: pid 1607:/tmp/bracket/build/2015.09.04.07.38.05-i386/src/external/bsd/iscsi/lib/../dist/src/lib/target.c:1502: ***ERROR*** execute_t() failed 
   Sep  4 15:15:33 foo iscsi-target: pid 1607:/tmp/bracket/build/2015.09.04.07.38.05-i386/src/external/bsd/iscsi/lib/../dist/src/lib/target.c:1108: ***ERROR*** cmd.tsih 0 not found 

>Fix: