Make Client Name options less ambiguous

Choosing client "Any" is confusing, as it suggests any client
can connect to the tunnel. In reality this options means no client
can connect to the tunnel. Changed it to "No client" in the UI and
"none" in the database.

webui/index.tmpl

@@ -105,7 +105,7 @@
                <div class='input'>
                  <label for="client-name">Client Name:</label>
                  <select id="client-name" name="client-name">
-                   <option value="any">Any</option>
+                   <option value="none">No client</option>
                    {{range $id, $client := (index $.Users $.UserId).Clients}}
                    <option value="{{$id}}">{{$id}}</option>
                    {{end}}