even xenserverinvestigator returns true, that means host is up, but XAPI may not work
CLOUDSTACK-7779: UI > volume action filter, snapshot action filter > extend scope from local to global.
CLOUDSTACK-7779: UI > volume action filter, snapshot action filter > extend scope from local to global..
CLOUDSTACK-7779: UI > affinity group action filter > extend scope from local to global.
CLOUDSTACK-7779: UI > system action filter > extend scope from local to global.
CLOUDSTACK-7780: UI > storage > volume > detail view > data provider > remove unnecessary module check.