Release Note: -groupname Option Added to keytool Key Pair Generation

A new `-groupname` option has been added to `keytool -genkeypair` so that a user can specify a named group when generating a key pair. For example, `keytool -genkeypair -keyalg EC -groupname secp384r1` will generate an EC key pair by using the `secp384r1` curve. Because there might be multiple curves with the same size, using the `-groupname` option is preferred over the `-keysize` option.