mod_admin_shell: Support setting roles on hosts other than the users' Needed to e.g. grant admin rights on a component, or grant non-local users local privileges. Leave the same host syntax for convenience, since this might be the common case.

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"util.compat".xpcall;
end

return {
	xpcall = xpcall;
};