[SCSI] bnx2i: Optimized the bnx2i_stop connection clean up procedure

For cases where the iSCSI disconnection procedure times out due to
the iSCSI daemon being slow or unresponsive, the bnx2i_stop routine
will now perform hardware cleanup via bnx2i_hw_ep_disconnect on all
active endpoints so that subsequent operations will perform properly.
Also moved the mutex locks inside ep_connect and ep_disconnect so
that proper exclusivity can resolve simultaneous calls to the
ep_disconnect routine.

v2: Removed the unnecessary read lock in the bnx2i_stop

Signed-off-by: Eddie Wai <[email protected]>
Reviewed-by: Michael Chan <[email protected]>
Reviewed-by: Benjamin Li <[email protected]>
Acked-by: Anil Veerabhadrappa <[email protected]>
Reviewed-by: Mike Christie <[email protected]>
Signed-off-by: James Bottomley <[email protected]>

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