Prepare for multiple TLS PRF functions by renaming the SHA1+MD5 based
TLS PRF function to more specific name and add tls_prf() within the
internal TLS implementation as a wrapper for this for now.
Signed-hostap: Jouni Malinen <j@w1.fi>
The test with very large iterations count is commented out since it
takes quite long to derive (it does pass, though). In addition, the
last test vector is commented out since pbkdf2_sha1() does not support
arbitrary binary passphrases (\0 inside the string).