public class MockServerRule
Improved version of MockServerRule:
It does not find new free port if perTestSuite is set to true. The original implementation, even
when mock server is reused, calls PortFactory.findFreePort() in the constructor. This call is
unnecessary ans slows down the test.
Supports providing log level and defaults to Level.WARN. With Level.INFO there were too many
logged lines and builds were crashing on Bamboo.