Csala f gh264 add timeout to service invoke

Implemented live test cases as we discussed.
I took advantage of the chance to move all the logic for live testing into `code/zato-server/test/zato/server/live/\__init\__.py`, so now extending from class LiveTestCase is enough to cover the optional service deployment during tests.
I also increase the delay between service deployment and test execution to 1 second because in some cases the 200ms previously defined were not enough and the tests failed randomly.