Ensure no benchmark regression on release

To ensure no performance regression on release, some benchmarks are to be run.
Benchmarks to be run :

• connection time
• do 1 (minimum query without resultset)
• SELECT 1 ( minimum query with resultset)
• SELECT * FROM mysql.user ( query with resultset and 46 fields )
• SELECT 10*REPEAT('a', 100) from seq_1_to_100000 (very big resulset)

project on https://github.com/rusher/mariadb-java-driver-benchmark