Added user agent for Azure Traffic Manager and Azure AppService AlwaysOn as crawlers

[szilardd]

Azure Traffic Manager

When using Azure Traffic Manager endpoint monitoring, if the Path is set to /, a guest Customer will be created every time the traffic manager calls the url. This can be disabled by configuring the user agent as a crawler:

<browscapitem name="Azure Traffic Manager Endpoint Monitor"> <!-- Azure Traffic Manager -->
  <item name="Crawler" value="true" />
</browscapitem>

Azure App Service AlwaysOn

When using Azure App Service Always On functionality, it will call the root url every 5 minutes, which also creates a guest Customer on each request. This can be disabled by configuring the Always On user agent as a crawler:

<browscapitem name="AlwaysOn"> <!-- Azure AppService AlwaysOn -->
  <item name="Crawler" value="true" />
</browscapitem>