Fix #144: replace TARGETSYS to STATION in all tests

class TestServoSetupCmd(unittest2.TestCase):

    """Test the servoSetup command"""

    telescope = os.getenv('TARGETSYS')

    telescope = os.getenv('STATION')

    def setUp(self):

        self.client = PySimpleClient()

class TestSetServoASConfigurationCmd(unittest2.TestCase):

    """Test the setServoASConfiguration command"""

    telescope = os.getenv('TARGETSYS')

    telescope = os.getenv('STATION')

    def setUp(self):

        self.client = PySimpleClient()

class TestSetServoElevationTrackingCmd(unittest2.TestCase):

    """Test the setServoElevationTracking command"""

    telescope = os.getenv('TARGETSYS')

    telescope = os.getenv('STATION')

    def setUp(self):

        self.client = PySimpleClient()

class TestSetServoOffsetCmd(unittest2.TestCase):

    """Test the setServoOffset command"""

    telescope = os.getenv('TARGETSYS')

    telescope = os.getenv('STATION')

    def setUp(self):

        self.client = PySimpleClient()

class TestClearUserOffset(unittest2.TestCase):

    telescope = os.getenv('TARGETSYS')

    telescope = os.getenv('STATION')

    @classmethod

    def setUpClass(cls):