New config session_path

[ChuckNorrison]

If more than one testlink is used on a webserver, it is possible now to
specify path to save sessions. In Default the new session_path will not
be used. If session_path is used the session files from php will be
saved to that path. So multiple testlink instances can be used at the
same time.

[ChuckNorrison]

Cause of session_save_path is used, you have to delete old session files by yourself. Code added after session_save_path is set:

    //Cleanup old sessions files
    if (file_exists(config_get('session_path'))) {
        $CurrentTime = time();
        $MaxLifeTime = 2*24*60*60;
        foreach (new DirectoryIterator(config_get('session_path')) as $fileInfo) {
            if ($fileInfo->isDot()) {
                continue;
            }
            if ( ($CurrentTime - $fileInfo->getCTime()) >= $MaxLifeTime ) {
                if (substr($fileInfo->getFilename(),0,5) === "sess_") {
                    unlink($fileInfo->getRealPath());
                }
            }
        }
    }

[squash-labs]

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Test this branch here: https://session-path-nehj8.squash.io