replaceServer = function(slist, serverInfo) {
  for(var i=0, l=slist.length; i<l; i++) {
    if(slist[i].id === serverInfo.id) {
      slist[i] = serverInfo;
      return;
    }
  }
  slist.push(serverInfo);
}
Remove crons from current application at runtime.

@param  {Array} crons old crons would be removed in application
@memberOf Application