Don't hardcode the path to test cases

[thozza]

When the network-testing is installed as RPM package, it is not possible to run the test cases from custom path.

The path where to look for test cases is hard-coded in the sources network_testing/client_server.py:

...
data_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')
testcase_path = os.path.join(data_path, 'testcases', 'client-server')

...

class TestSuite:
    def __init__(self, testcases=None, scenarios=None):
        self.testcases = [Testcase(name, scenarios) for name in os.listdir(testcase_path)]
        if testcases:
            self.testcases = [testcase for testcase in self.testcases if testcase.name in testcases]
...

The driver may look for the test cases in some predefined directory, but it should be definitely possible to run testcases from defined path.

[pavlix]

Is there a specific use case, yet?

[thozza]

Just the ease of use. This would allow to have separate test cases from what is distributed directly with the project. Please see issue #21, I think it these two are connected.