Use FingerprintUtil in test

Author: vanitasvitae

pg/src/test/java/org/bouncycastle/bcpg/test/OnePassSignaturePacketTest.java

@@ -115,14 +115,7 @@ private void roundtripV6Packet()
     {
         byte[] salt = new byte[32];
         byte[] fingerprint = Hex.decode("CB186C4F0609A697E4D52DFA6C722B0C1F1E27C18A56708F6525EC27BAD9ACC9");
-        long keyID = ((fingerprint[0] & 0xffL) << 56) |
-                        ((fingerprint[1] & 0xffL) << 48) |
-                        ((fingerprint[2] & 0xffL) << 40) |
-                        ((fingerprint[3] & 0xffL) << 32) |
-                        ((fingerprint[4] & 0xffL) << 24) |
-                        ((fingerprint[5] & 0xffL) << 16) |
-                        ((fingerprint[6] & 0xffL) << 8) |
-                        ((fingerprint[7] & 0xffL));
+        long keyID = FingerprintUtil.keyIdFromV6Fingerprint(fingerprint);
 
         new SecureRandom().nextBytes(salt);
         OnePassSignaturePacket before = new OnePassSignaturePacket(