When no CSP is provided, we were listing smartcard materials by querying the
MS_SCARD_PROV_A CSP, unfortunately on some windows hosts, the smartcards aren't
listed in that CSP. So this patch does the key listing by browsing all CSPs
instead of just a default one. You can still force a CSP and you'll get keys only
from this one.
This patch also address cases where the certificate on the smartcard doesn't
have a UPN attribute, if that happen we try to get a UPN from the email address.
3947294ffb