Remove userland side of ISCSI_DEBUG and ISCSI_TEST_MODE.

give the correct count of arguments to the sub-functions

Use __dead

remove some lint

add printflike and fix the format error.

Start to move the in-kernel iSCSI initiator, kindly contributed to the
NetBSD Foundation by Wasabi Systems, from

othersrc/external/bsd/iscsi/{iscsictl,iscsid}

to

src/sbin/{iscsictl,iscsid}