Scripts for using ECC ciphersuites with test/testssl.

Use ECCcertgen.sh, RSAcertgen.sh, ECC-RSAcertgen.sh to generate
root, client and server certs of the following types:

     ECC certs signed with ECDSA
     RSA certs signed with RSA
     ECC certs signed with RSA

Afterwards, you can use ssltest.sh to run the various tests;
specify one of the following options:

     aecdh, ecdh-ecdsa, ecdhe-ecdsa, ecdh-rsa, ecdhe-rsa