RFR 8214179: Add groupname info into keytool -list and -genkeypair output

[Weijun Wang]

Please take a review at

  https://cr.openjdk.java.net/~weijun/8214179/webrev.00/

Before this change, `keytool -genkeypair -keyalg EC -groupname brainpoolP256r1` shows

  Generating -1 bit EC key pair and self-signed certificate...

With this change, the message becomes

  Generating brainpoolP256r1 EC key pair and self-signed certificate...

Also, `keytool -list -v` can show

  Subject Public Key Algorithm: 256-bit EC(brainpoolP256r1) key

Thanks
Max