[4/4] advapi32/tests: Check that a credential type is supported before testing it. Test CRED_TYPE_DOMAIN_VISIBLE_PASSWORD credentials. Factorize the CredentialBlob checks.

[Francois Gouget]

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This patch fixes the tests on my Windows XP system.

For whatever reason it does not want to store CRED_TYPE_DOMAIN_PASSWORD 
credentials. However it advertises that clearly in CredGetSessionTypes() 
so we should not even try (and now we don't).

My Windows XP system is ok with CRED_TYPE_DOMAIN_VISIBLE_PASSWORD and 
it's simple enough to test so I added it. And now Wine clearly 
advertises that it does not support these so there's no failure in Wine 
either.

Maybe CRED_TYPE_DOMAIN_VISIBLE_PASSWORD is simple enough to implement in 
Wine?

 dlls/advapi32/tests/cred.c |   80 +++++++++++++++++++++++++++++++++-----------
 1 files changed, 60 insertions(+), 20 deletions(-)
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