maxscale-system-test changed in order to control test environment by itself.
Every test checks which machines are running, compare with list of needed machines
and start new VMs is they are missing in the running machines list.
Tests are executiong MDBCI commands, MDBCI executable should be in the PATH
The test inserted 200k rows with autocommit enabled which made it very
slow. Wrapping the inserts inside a transaction gives the test a
significant speed boost.