Skip SMSD tests when database driver unavailable

[Copilot]

SMSD tests fail when Gammu is built without SQLite support (e.g., PostgreSQL-only builds), throwing ERR_UNKNOWN from SMSD_ReadConfig due to hardcoded SQLite driver in test config.

Changes

• Probe SMSD initialization in setUp() and skip test class when driver unavailable
• Detect driver errors by checking SMSD_ReadConfig location or error codes 27/75
• Import gammu module for GSMError exception handling

# Check if SMSD with SQLite driver is available
try:
    smsd = gammu.smsd.SMSD(self.config_name)
    del smsd
except gammu.GSMError as exc:
    error_info = exc.args[0] if exc.args else {}
    if error_info.get("Where") == "SMSD_ReadConfig" or error_info.get("Code") in (27, 75):
        raise unittest.SkipTest("SMSD initialization failed (Gammu may be built without required database driver support)")
    raise

Tests now skip gracefully instead of failing on systems with different Gammu database driver configurations.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Skip Database tests or make it more correct</issue_title>
<issue_description>Installed gammu 1.38.5/1.40.1, builded with postgresql. But python-gammu 2.12 fail tests:

test_inject (test.test_smsd.SMSDDummyTest) ... Fri 2019/11/01 15:50:09 python-gammu[23837]: Using SQL service
Fri 2019/11/01 15:50:09 python-gammu[23837]: Configuring Gammu SMSD...
Fri 2019/11/01 15:50:09 python-gammu[23837]: SHM token: 0x103715e (17002846)
Fri 2019/11/01 15:50:09 python-gammu[23837]: Warning: No PIN code in /var/calculate/tmp/portage/dev-python/python-gammu-2.12/temp/tmployHVJ/.gammurc file
Fri 2019/11/01 15:50:09 python-gammu[23837]: CommTimeout=1, SendTimeout=30, ReceiveFrequency=15, ResetFrequency=0, HardResetFrequency=0
Fri 2019/11/01 15:50:09 python-gammu[23837]: checks: CheckSecurity=1, CheckBattery=1, CheckSignal=1, CheckNetwork=1
Fri 2019/11/01 15:50:09 python-gammu[23837]: mode: Send=1, Receive=1
Fri 2019/11/01 15:50:09 python-gammu[23837]: deliveryreport = no
Fri 2019/11/01 15:50:09 python-gammu[23837]: phoneid = 
Fri 2019/11/01 15:50:09 python-gammu[23837]: Unknown DB driver
ERROR

(twice)

======================================================================
ERROR: test_inject (test.test_smsd.SMSDDummyTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/var/calculate/tmp/portage/dev-python/python-gammu-2.12/work/python-gammu-2.12/test/test_smsd.py", line 91, in test_inject
    smsd = self.get_smsd()
  File "/var/calculate/tmp/portage/dev-python/python-gammu-2.12/work/python-gammu-2.12/test/test_smsd.py", line 85, in get_smsd
    return gammu.smsd.SMSD(self.config_name)
ERR_UNKNOWN: {'Text': u'Unknown error.', 'Code': 27, 'Where': 'SMSD_ReadConfig'}

(twice too)

FAILED (errors=2)
Test failed: <unittest.runner.TextTestResult run=50 errors=2 failures=0>
python-gammu: WARNING: Adding USSD to queue, position 0
Gammu version (1, 40, 0), SMSD DB version 17
Gammu version (1, 40, 0), SMSD DB version 17
Log filename is "stderr"
Gammu version (1, 40, 0), SMSD DB version 17
Log filename is "stderr"
error: Test failed: <unittest.runner.TextTestResult run=50 errors=2 failures=0>

With 1.38.5 same result. Perhaps it's not bug, but need explanations...</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Skip Database tests or make it more correct #36

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