os_linux.cpp: Use SG_IO instead of deprecated SCSI ioctl

[Christian Franke]

Some controller specific functions in os_linux.cpp still use some old SCSI pass-through ioctl. This may result in syslog messages like:

... kernel: [...] program smartd is using a deprecated SCSI ioctl, please convert it to SG_IO

SG_IO should be used if supported.

[Alex Samorukov]

See #782 for the patch

[Alex Samorukov]

Places affected:

1. SCSI_IOCTL_SEND_COMMAND in the sisc_cmnd_io, using linux_ioctl_send_command structure, called only from do_normal_scsi_cmnd_io, should be addressed by #782.
2. In the linux_escalade_device::ata_pass_through (using TW_Ioctl structure)
3. In the linux_marvell_device::ata_command_interface (sending mvsata_scsi_cmd structure)

I think that it would be hard, if possible to fix 2 and 3, because we do not have access to this hardware. So i think we can close it after merging #782.

[Christian Franke]

1. Was not intended to be addressed by this ticket as the generic SCSI code already used SG_IO if supported.
2. SCSI_IOCTL_SEND_COMMAND is only used if m_escalade_type==AMCC_3WARE_678K for very old 3ware (6|7|8)000 (P|P|S)ATA RAID controllers.
3. If have no idea whether -d marvell does still work and is still useful (see also #54). Original code was merged to trunk 13+ years ago in r1881. Related hardware is likely outdated.

[Christian Franke]

Related hardware is outdated and unavailable.