[SCSI] ALUA: send STPG if explicit and implicit is supported

alua_activate only sends a STPG if only explicit is suppored.
As a result, for EMC targets that support both we end up doing
a implicit failover when X commands are finally sent to
the other SP.

This patch does a AND on the h->tpgs, so we do a explicit failover
right away.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

drivers/scsi/device_handler/scsi_dh_alua.c

@@ -663,7 +663,7 @@ static int alua_activate(struct scsi_device *sdev)
 			goto out;
 	}
 
-	if (h->tpgs == TPGS_MODE_EXPLICIT && h->state != TPGS_STATE_OPTIMIZED)
+	if (h->tpgs & TPGS_MODE_EXPLICIT && h->state != TPGS_STATE_OPTIMIZED)
 		err = alua_stpg(sdev, TPGS_STATE_OPTIMIZED, h);
 
 out: