file and read the swap metadata.
- Changed store_client->mem to ->entry because we need
e->swap_file_sz to set mem->object_sz at swapin.
- - Removed some superfluous checks for e->key != NULL in
- storeSet*Key().
- Renamed storeSwapData structure to storeSwapLogData.
- Fixed storeGetNextFile to not increment d->dirn. Added
check for opendir() failure.