[Database v0005] Change server.ssl_state column type to tinyint

- Fix "Data truncated" SQL error with server.ssl_state column type

src/sql/migrations/down/0004.sql

@@ -0,0 +1,3 @@
+BEGIN;
+ALTER TABLE `server` MODIFY `ssl_state` bit(1) NULL;
+COMMIT;

src/sql/migrations/up/0005.sql

@@ -0,0 +1,5 @@
+BEGIN;
+UPDATE `server` SET `ssl_state` = 0 WHERE `ssl_state` IS NULL;
+
+ALTER TABLE `server` MODIFY `ssl_state` tinyint(1) DEFAULT 0 NOT NULL;
+COMMIT;