Default to hx509_signature_ecdsa_with_sha1 since private crypto backend must be the one that selects the credential since the ec group might not be able to handle sha256.
Default to hx509_signature_ecdsa_with_sha1 since private crypto
backend must be the one that selects the credential since the ec group
might not be able to handle sha256.

git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@24665 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal