NIST KASVS values for DH and ECDH

http://csrc.nist.gov/groups/STM/cavp/documents/keymgmt/kastestvectors.zip

Only the "Static" scheme is added here since we are only testing the
primitive DH and ECDH key agreement operation.
Merge pull request #1264 from public/dh-vectors

NIST KASVS values for DH and ECDH