full_scan in shell client can't terminate by time out

Commands:
```
>>> use stat
OK
>>> full_scan -h prefix -x 2019-10
partition: all
hash_key_filter_type: prefix
hash_key_filter_pattern: "2019-10"
sort_key_filter_type: no_filter
value_filter_type: no_filter
max_count: -1
timout_ms: 5000
detailed: false
no_value: false
```
When the table is large, it will return values after several minutes, but no hint of timeout

Reproduce the `full_scan -h prefix -x 2019-10` command against a large table with `timout_ms: 5000`, then trace timeout handling in the shell client. Done means the scan terminates and reports the timeout instead of returning values only after several minutes.

Written by the indexing model from the issue text.