Add GOST TC-26 OIDs.

Reference:

The technical committee website:
http://www.tc26.ru/metodiki/OID_TK_26/index.php
Russian standards organization on cryptography and security mechanisms.
Introduce GOST R 34.11-2012 standalone hash as EV_MD

This is a prerequisite for implementation
of GOST R 34.10-2012.

Adds the test case with vectors from RFC #6986.