some bug fixes (#25)

1. BinlogSocketConnect refactoring error ( mariadb is not working)
2. binlog_checksum

Author: kobi97

src/MySQLReplication/BinLog/BinLogSocketConnect.php

@@ -159,7 +159,8 @@ private function getBinlogStream()
             $this->execute('SET @slave_connect_state = \'' . Config::getMariaDbGtid() . '\'');
             $this->execute('SET @slave_gtid_strict_mode = 0');
             $this->execute('SET @slave_gtid_ignore_duplicates = 0');
-        } else if ('' !== Config::getGtid()) {
+        }
+        if ('' !== Config::getGtid()) {
             $this->setBinLogDumpGtid();
         } else {
             $this->setBinLogDump();

src/MySQLReplication/Repository/MySQLRepository.php

@@ -75,7 +75,13 @@ public function isCheckSum()
     {
         $res = $this->getConnection()->fetchAssoc('SHOW GLOBAL VARIABLES LIKE "BINLOG_CHECKSUM"');
 
-        return isset($res['Value']);
+		if (!isset($res['Value'])) {
+			return false;
+		}
+
+		$check_sum = $res['Value'];
+
+		return (!empty($check_sum) && strtolower($check_sum) !== 'none');
     }
 
     /**