crypto: hash: add hash driver framework

1) makes the public APIs in hash-nettle/gcrypt/glib static,
   and rename them with "nettle/gcrypt/glib" prefix.

2) introduces hash framework, including QCryptoHashDriver
   and new public APIs.

Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

crypto/hash.c

@@ -21,6 +21,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "crypto/hash.h"
+#include "hashpriv.h"
 
 static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
     [QCRYPTO_HASH_ALG_MD5] = 16,
@@ -38,6 +39,18 @@ size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
     return qcrypto_hash_alg_size[alg];
 }
 
+int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
+                        const struct iovec *iov,
+                        size_t niov,
+                        uint8_t **result,
+                        size_t *resultlen,
+                        Error **errp)
+{
+    return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
+                                               result, resultlen,
+                                               errp);
+}
+
 
 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
                        const char *buf,