Add SshdConfigFile and WMIComputerSystemProduct

@joachimmetz 

$ python run_tests.py 
testRead (artifacts.reader_test.YamlArtifactsReadertest)
Tests the Read function. ... ok
testArtifactDefinitionsRegistry (artifacts.registry_test.ArtifactDefinitionsRegistryTest)
Tests the ArtifactDefinitionsRegistry functions. ... ok
testArtifactDefinitionsValidator (tools.validator_test.ArtifactDefinitionsValidatorTest)
Runs the validator over all the YAML artifact definitions files. ... ok

----------------------------------------------------------------------
Ran 3 tests in 0.279s

OK