Convert a PKCS#1 formatted java private key to PKCS#8

to pkcs8 format

In BouncyCastle version 1.60 you can convert a PKCS#1 formatted private key to PKCS#8 with this method:

```
public static byte[] toPKCS8Format(final PrivateKey privateKey) throws IOException
	{
		String keyFormat = privateKey.getFormat();
		if (keyFormat.equals("PKCS#1")) {
			final byte[] encoded = privateKey.getEncoded();
			final PrivateKeyInfo privateKeyInfo = PrivateKeyInfo.getInstance(encoded);
			final ASN1Encodable asn1Encodable = privateKeyInfo.parsePrivateKey();
			final ASN1Primitive asn1Primitive = asn1Encodable.toASN1Primitive();
			final byte[] privateKeyPKCS8Formatted = asn1Primitive.getEncoded(ASN1Encoding.DER);
			return privateKeyPKCS8Formatted;			
        }
		return privateKey.getEncoded();
	}
```