Add feature read data from file and secondary_ranges

[rockeet]

This PR add two features to sysbench:

1. Read data from a file instead of generate random data by cmd option filename
   • This is to benchmark database by real world data
   • Users can provide filename as their real data
2. secondary_ranges: select table data by secondary key without covering index(force Database to fetch rows from table data)
   • This benchmark mysql MRR(Multiple Range Read)