Trust domains Web UI
    
    Add Web UI counterpart of following CLI commands:
    
    * trust-fetch-domains Refresh list of the domains associated with the trust
    * trustdomain-del Remove infromation about the domain associated with the trust.
    * trustdomain-disable Disable use of IPA resources by the domain of the trust
    * trustdomain-enable Allow use of IPA resources by the domain of the trust
    * trustdomain-find Search domains of the trust
    
    https://fedorahosted.org/freeipa/ticket/4119