[dbal]: make dbal connection config usable again

right now user cannot declare connection options.

Reason is that always 'connection' => 'url' was set which dbal always prefers over other
connection settings. With this fix connection can be defined dbal compliant like this:

      connection:
        host: 'localhost'
        port: '3306'
        dbname: 'app'
        user: 'app'
        password: ''

'dsn only' works like before.

Author: ssiergl

Diff for: pkg/dbal/DbalConnectionFactory.php

@@ -45,8 +45,7 @@ public function __construct($config = 'mysql:')
             $config = $this->parseDsn($config);
         } elseif (is_array($config)) {
             if (array_key_exists('dsn', $config)) {
-                $config = array_replace_recursive($config, $this->parseDsn($config['dsn']));
-
+                $config = array_replace_recursive($config, $this->parseDsn($config['dsn'], $config));
                 unset($config['dsn']);
             }
         } else {
@@ -92,7 +91,12 @@ private function establishConnection(): Connection
         return $this->connection;
     }
 
-    private function parseDsn(string $dsn): array
+    /**
+     * @param string $dsn
+     * @param array|null $config
+     * @return array
+     */
+    private function parseDsn(string $dsn, array $config = null): array
     {
         if (false === strpos($dsn, ':')) {
             throw new \LogicException(sprintf('The DSN is invalid. It does not have scheme separator ":".'));
@@ -135,6 +139,20 @@ private function parseDsn(string $dsn): array
 
         $doctrineScheme = $supported[$scheme];
 
+        if (is_array($config) && key_exists('connection', $config)) {
+            $default = [
+                'driver' => $doctrineScheme,
+                'host' => 'localhost',
+                'port' => '3306',
+                'user' => 'root',
+                'password' => '',
+            ];
+            return [
+                'lazy' => true,
+                'connection' => array_replace_recursive($default, $config['connection']),
+            ];
+        }
+
         return [
             'lazy' => true,
             'connection' => [