MFC r278622 (by trasz): Remove unused code.

MFC r285086:

Remove OpenSSL dependency from iscsid(8) and ctld(8).

Sponsored by: The FreeBSD Foundation

MFC r274853:
For both iSCSI initiator and target increase socket buffer sizes before
establishing connection.

This is a workaround for Chelsio TOE driver, that does not update socket
buffer size in hardware after connection established, and unless that is
done beforehand, kernel code will stuck, attempting to send/receive full
PDU at once.

MFC r273459:

Untangle iSCSI authentication code by splitting off the CHAP
implementation.

Sponsored by: The FreeBSD Foundation

MFC r268326:
Make iSCSI initiator keep Initiator Session ID (ISID) across reconnects.

Previously ISID was changed every time, that made impossible correct
persistent reservation, because reconnected session was identified as
completely new one.

MFC r264549:

Make it possible for the initiator side to operate in both proxy
and normal mode; this makes it possible to compile with the former
by default, but use it only when neccessary. That's especially
important for the userland part.

Sponsored by: The FreeBSD Foundation

MFC r261715:

The log_whatever() routines don't accept NULL for format strings,
so mark them as __printflike instead of __printf0like.

Sponsored by: The FreeBSD Foundation

MFC r278622 (by trasz): Remove unused code.

MFC r285086:

Remove OpenSSL dependency from iscsid(8) and ctld(8).

Sponsored by: The FreeBSD Foundation

MFC r274853:
For both iSCSI initiator and target increase socket buffer sizes before
establishing connection.

This is a workaround for Chelsio TOE driver, that does not update socket
buffer size in hardware after connection established, and unless that is
done beforehand, kernel code will stuck, attempting to send/receive full
PDU at once.

MFC r273459:

Untangle iSCSI authentication code by splitting off the CHAP
implementation.

Sponsored by: The FreeBSD Foundation

MFC r268326:
Make iSCSI initiator keep Initiator Session ID (ISID) across reconnects.

Previously ISID was changed every time, that made impossible correct
persistent reservation, because reconnected session was identified as
completely new one.

MFC r264549:

Make it possible for the initiator side to operate in both proxy
and normal mode; this makes it possible to compile with the former
by default, but use it only when neccessary. That's especially
important for the userland part.

Sponsored by: The FreeBSD Foundation

MFC r261715:

The log_whatever() routines don't accept NULL for format strings,
so mark them as __printflike instead of __printf0like.

Sponsored by: The FreeBSD Foundation