MDEV-12321 authentication plugin: SET PASSWORD support

Support SET PASSWORD for authentication plugins.

Authentication plugin API is extended with two optional methods:
* hash_password() is used to compute a password hash (or digest)
  from the plain-text password. This digest will be stored in mysql.user
  table
* preprocess_hash() is used to convert this digest into some memory
  representation that can be later used to authenticate a user.
  Build-in plugins convert the hash from hexadecimal or base64 to binary,
  to avoid doing it on every authentication attempt.

Note a change in behavior: when loading privileges (on startup or on
FLUSH PRIVILEGES) an account with an unknown plugin was loaded with a
warning (e.g. "Plugin 'foo' is not loaded"). But such an account could
not be used for authentication until the plugin is installed. Now an
account like that will not be loaded at all (with a warning, still).
Indeed, without plugin's preprocess_hash() method the server cannot know
how to load an account. Thus, if a new authentication plugin is
installed run-time, one might need FLUSH PRIVILEGES to activate all
existing accounts that were using this new plugin.

1 files changed, 8 insertions, 3 deletions

diff --git a/mysql-test/main/failed_auth_unixsocket.result b/mysql-test/main/failed_auth_unixsocket.result
index 680d3b48a33..3b2cff7e845 100644
--- a/mysql-test/main/failed_auth_unixsocket.result
+++ b/mysql-test/main/failed_auth_unixsocket.result
@@ -1,10 +1,15 @@
 update mysql.user set plugin='unix_socket';
 flush privileges;
+Warnings:
+Warning	1524	Plugin 'unix_socket' is not loaded
+Warning	1524	Plugin 'unix_socket' is not loaded
+Warning	1524	Plugin 'unix_socket' is not loaded
+Warning	1524	Plugin 'unix_socket' is not loaded
 connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET);
-connect  fail,localhost,$USER;
-ERROR HY000: Plugin 'unix_socket' is not loaded
-ERROR HY000: Plugin 'unix_socket' is not loaded
+ERROR 28000: Access denied for user 'USER'@'localhost' (using password: NO)
+ERROR 28000: Access denied for user 'USER'@'localhost' (using password: NO)
 install plugin unix_socket soname 'auth_socket.so';
+flush privileges;
 connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET);
 ERROR 28000: Access denied for user 'USER'@'localhost'
 ERROR 28000: Access denied for user 'USER'@'localhost'