use saner default parameters for scrypt

Thanks to Colin Percival for reporting this issue.

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/apps/pkcs8.c b/apps/pkcs8.c
index 125bf61..0968fef 100644
--- a/apps/pkcs8.c
+++ b/apps/pkcs8.c
@@ -203,9 +203,9 @@
             break;
 #ifndef OPENSSL_NO_SCRYPT
         case OPT_SCRYPT:
-            scrypt_N = 1024;
+            scrypt_N = 16384;
             scrypt_r = 8;
-            scrypt_p = 16;
+            scrypt_p = 1;
             if (cipher == NULL)
                 cipher = EVP_aes_256_cbc();
             break;