Update the test framework so that the need for test_main is removed.  Everything
that needed test_main now works using the same infrastructure as tests that used
register_tests.

This meant:
* renaming register_tests to setup_tests and giving it a success/failure return.
* renaming the init_test function to setup_test_framework.
* renaming the finish_test function to pulldown_test_framework.
* adding a user provided global_init function that runs before the test frame
    work is initialised.  It returns a failure indication that stops the stest.
* adding helper functions that permit tests to access their command line args.
* spliting the BIO initialisation and finalisation out from the test setup and
    teardown.
* hiding some of the now test internal functions.
* fix the comments in testutil.h

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3953)
diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
index d780161..acccfe5 100644
--- a/test/evp_extra_test.c
+++ b/test/evp_extra_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -16,6 +16,7 @@
 #include <openssl/rsa.h>
 #include <openssl/x509.h>
 #include "testutil.h"
+#include "e_os.h"
 
 /*
  * kExampleRSAKeyDER is an RSA private key in ASN.1, DER format. Of course, you
@@ -346,13 +347,13 @@
 }
 #endif
 
-void register_tests(void)
+int setup_tests(void)
 {
     ADD_TEST(test_EVP_DigestSignInit);
     ADD_TEST(test_EVP_DigestVerifyInit);
-    ADD_ALL_TESTS(test_d2i_AutoPrivateKey,
-                  sizeof(keydata) / sizeof(keydata[0]));
+    ADD_ALL_TESTS(test_d2i_AutoPrivateKey, OSSL_NELEM(keydata));
 #ifndef OPENSSL_NO_EC
     ADD_TEST(test_EVP_PKCS82PKEY);
 #endif
+    return 1;
 }