PKCS11 example for doing a CSR generation and creating signed certificate

[dgarske]

This is a rough template for:

1. Creating a new ECC key
2. Creating a CSR based on the new ECC key
3. Creating a new certificate based on CSR, populating issuer
4. Certificate signing based on a PKCS11 ECC key (using devId setup with PKCS11 crypto callback wc_Pkcs11_CryptoDevCb).