Add rcube_imap_generic::getUser() method

It's sometimes useful when all we have is the connection object

Author: alecpl

program/lib/Roundcube/rcube_imap_generic.php

@@ -1177,6 +1177,16 @@ public function closeConnection()
         $this->clearCapability();
     }
 
+    /**
+     * Get crrent user.
+     *
+     * @return string|null Current username set for the connection
+     */
+    public function getUser()
+    {
+        return $this->user;
+    }
+
     /**
      * Executes SELECT command (if mailbox is already not in selected state)
      *