mptsas: add TUR with retries to ensure LUNs complete initialization

mptsas: add TUR with retries to ensure LUNs complete initialization

Orabug: 24745062

Earlier versions of the mptsas driver included a mechanism for
executing, and if necessary retrying, SCSI TEST UNIT READY commands
to ensure that devices complete their initialization during device
discovery.  This functionality, present in UEK2, was never sent
upstream, and was lost when UEK4 was initiated.

We have been seeing flash devices returning errors, or simply
disappearing, during alter cell validate configuration operations
on Exadata systems.  Giving the flash disks time to initialize
after (re-) discovery appears to resolve this issue.

This commit simply restores the missing functionality.

Signed-off-by: Dan Duval <dan.duval@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>