PKCS#8 serialized key loading
Add pkcs8_serialization mark
Removed unused doc reference
Added marker condif to pytest.ini
Unencrypted 1024-bit DSA key in PKCS#8

Generated by myself.
Test PKCS#8 DSA key loads OK
Bind another error code
Add PKCS#8 key with unknown OID

This is unenc-dsa-pkcs8.pem with the base64 OID replaced with X's
Unknown algorithm test for PKCS8
Add PKCS8 key with bad encryption OID

This is encpkcs8.pem with the base64 OID replaced with Ys
Add unknown cipher test for PKCS8
Update exception tags
Check DSA key material
Error codes are different in OpenSSL 1.0.1
Merge pull request #877 from public/pkcs8-loading

PKCS #8 loading