A combination of --tables and --threads with non-default (i.e. higher
than 1) values resulted in incompleted set of tables generated by
"prepare" for the oltp_insert.lua script.
All bundled OLTP tests now declare their supported options. Which means:
- unknown options are not be silently accepted, but throw an
error (fixes#15)
- 'sysbench /any OLTP script/ help' now prints a list of supported
options, their descriptions, types and default values just as built-in
tests do (fixes#79)
