Display linked templates to templates in Host configuration page

if a template has other templates assigned it will be displayed in the "Linked templates" as

Template_AIX_53 (Template_AIX, Template_Unix)

Template_AIX_53 is based on Template_AIX and Template_Unix. Only linked templates of one level are displayed, we won't go to lower levels.

If a template does not have any dependencies, it will be displayed as it is now, just a template name.