[SCSI] libsas: convert ha->state to flags
In preparation for adding new states (SAS_HA_DRAINING, SAS_HA_FROZEN), convert ha->state into a set of flags. Signed-off-by: NDan Williams <dan.j.williams@intel.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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