Core/BnetServer: Bnetserver cleanup

Port From (https://github.com/TrinityCore/TrinityCore/commit/e9392ad28767626e519c463e2110184d71ba8426)

sql/updates/auth/master/2020_08_02_00_auth.sql

@@ -0,0 +1,13 @@
+-- AUTH CLEANUP PHASE 3
+-- update `account` structure
+-- sha_pass_hash/s/v kept around for now, for backwards compatibility
+ALTER TABLE `account`
+    DROP COLUMN `sessionkey`,
+    ADD COLUMN `salt` BINARY(32) AFTER `username`,
+    ADD COLUMN `verifier` BINARY(32) AFTER `salt`,
+    ADD COLUMN `session_key` BINARY(40) AFTER `verifier`,
+    MODIFY COLUMN `s` VARCHAR(64) NOT NULL DEFAULT 'dummy value, use `salt` instead',
+    MODIFY COLUMN `v` VARCHAR(64) NOT NULL DEFAULT 'dummy value, use `verifier` instead';
+
+UPDATE `account` SET `salt`=REVERSE(UNHEX(`s`)), `s`=DEFAULT WHERE LENGTH(`s`)=64;
+UPDATE `account` SET `verifier`=REVERSE(UNHEX(`v`)), `v`=DEFAULT WHERE LENGTH(`v`)=64;

sql/updates/auth/master/2020_08_03_00_auth.sql

@@ -0,0 +1 @@
+ALTER TABLE `account` MODIFY COLUMN `session_key` VARBINARY(64) AFTER `verifier`;

sql/updates/auth/master/2020_08_03_01_auth.sql

@@ -0,0 +1,5 @@
+-- 
+ALTER TABLE `account`
+    DROP COLUMN `session_key`,
+    ADD COLUMN `session_key_auth` BINARY(40) DEFAULT NULL AFTER `verifier`,
+    ADD COLUMN `session_key_bnet` VARBINARY(64) DEFAULT NULL AFTER `session_key_auth`;