Add sysbench package

SysBench is a modular, cross-platform and multi-threaded benchmark tool
for evaluating OS parameters that are important for a system running a
database under intensive load.
Enable sysbench package
Call sysbench instead of stress in stresstest script
Do not put a getty on the serial port
Add network interfaces configuration
Add script for continuous integration testing
Let ttysnoop spawn integration test script
Add Kontron-specific integration test script

This script performs the following actions:
- Configure eth1 and ping integration server
- Call common integration test script
Let ttysnoop spawn integtest_kt script