Add a southern hemisphere pass test.

[gerritholl]

Add a test that passes over the south pole aren't confused with passes
over the north pole. I thought this test would fail, but it actually
passes, so the problem I found with pytroll-collectors adding a granule
to both areas is elsewhere.

There is no corresponding issue yes as I haven't yet found the cause of my problem; either it's a bug in my config or in a pytroll package, but I don't yet know where. Triggered by those log messages from gatherer (in pytroll-collectors):

    [DEBUG: 2021-02-03 17:21:27 : pytroll_collectors.trigger] mda: {'path': '', 'platform_name': 'Metop-B', 'start_time': datetime.datetime(2021, 2, 3, 16, 28, 3), 'end_time': datetime.datetime(2021, 2, 3, 16, 31, 3), 'processing_time': datetime.datetime(2021, 2, 3, 17, 19, 5), 'uri': '/data/pytroll/IN/EMC_AVR/AVHR_xxx_1B_M01_20210203162803Z_20210203163103Z_N_O_20210203171905Z', 'uid': 'AVHR_xxx_1B_M01_20210203162803Z_20210203163103Z_N_O_20210203171905Z', 'sensor': ['avhrr/3'], 'orig_platform_name': 'M01'}
    [DEBUG: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Adding area ID to metadata: eurol
    [INFO: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Added Metop-B (2021-02-03 16:28:03) granule to area eurol
    [DEBUG: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Adding area ID to metadata: nparktis1km
    [INFO: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Added Metop-B (2021-02-03 16:28:03) granule to area nparktis1km
    [DEBUG: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Adding area ID to metadata: spantarktis3km
    [INFO: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Added Metop-B (2021-02-03 16:28:03) granule to area spantarktis3km
    [DEBUG: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Adding area ID to metadata: npgroenland2200m
    [INFO: 2021-02-03 17:21:27 : pytroll_collectors.region_collector] Platform name Metop-B and sensor ['avhrr/3']: Start and end times = 20210203 16:28:03 20210203 16:31:03

• Closes #xxxx
• Tests added
• Tests passed
• Passes git diff origin/master **/*py | flake8 --diff

[ghost]

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[mraspaud]

LGTM, nice with some extra tests!