bug #34396 [Finder] Allow ssh2 stream wrapper for sftp (damienalexandre)

This PR was merged into the 3.4 branch.

Discussion
----------

[Finder] Allow ssh2 stream wrapper for sftp

Same fix as #28604 but for the ssh2.sftp wrapper.

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #28604 maybe
| License       | MIT
| Doc PR        |

Without this patch, we can't use the finder with ssh2.sftp connections.

```php
$connection = \ssh2_connect('host', 22);
\ssh2_auth_password($connection, 'user', 'pass');

$sftp = \ssh2_sftp($connection);
$path = "ssh2.sftp://".intval($sftp)."/";

$finder = new Finder();

foreach ($finder->in($path)->files() as $directory) {
    dump(file_get_contents($directory));
}
```

Without the patch:

>   RecursiveDirectoryIterator::__construct(ssh2.sftp://838): failed to open dir: operation failed

Commits
-------

e6c9d77 [Finder] Allow ssh2 stream wrapper for sftp

src/Symfony/Component/Finder/Finder.php

@@ -746,7 +746,7 @@ private function normalizeDir($dir)
     {
         $dir = rtrim($dir, '/'.\DIRECTORY_SEPARATOR);
 
-        if (preg_match('#^s?ftp://#', $dir)) {
+        if (preg_match('#^(ssh2\.)?s?ftp://#', $dir)) {
             $dir .= '/';
         }