API version check in JUnit test is too strict

[egueli]

The Junit test TraCIServerTest.testGetVersionHighLevel() checks that the API version reported by SUMO is exactly equal to the constant API_VERSION, and fails if the machine that runs the test has a different version of SUMO.
testGetVersionHighLevel should only test for a minimum API version that ensures that the basic message exchange still works. Breaking changes in higher level APIs, e.g. properties of TraCI objects, should be detected by JUnit tests.