Crypto libraries are starting to refuse to accept the old shorter keys,
so move all test certificates and DH to use 2048 bit (or longer) keys.
Signed-off-by: Jouni Malinen <j@w1.fi>
This format as a DER encoded blob is supported by both OpenSSL and
GnuTLS while the previous OpenSSL specific format did not get accepted
by GnuTLS.
Signed-off-by: Jouni Malinen <j@w1.fi>