uuid_short() to support sortable layout

uuid_short() is defined as

server_id << 56 +server_start_time << 24

Storing server_id in MSB makes ORDER BY sort it first by server, then by time.

A common request is to make it time-first sorted.

Two ways to do that:
1. bool add argument
2. add new function like uuid_short_sorted()

both ways it should use the existing uuid generator