refs #18464 - rename *.spec.js to *.test.js

fixes #18466 - change getHostsData function name to be singular

fixes #18464 - Add Redux to statistics page

This is a first step to replacing Flux with Redux

Fixes #18194, #18326 - minor UI bugs Notifications

persist open group on navigation
remove expand toggle indicator

fixes #18191,#18192 - monitor notification request

prevent multiple requests, stop polling after error

fixes #18010 - UI Notifications front-end implementation

fixes #17600 - Storybook does not draw chart

Fixes #17580 - React Chart Component has unsafe function

Fixes #17569 - prevent error on chart component unmount

Fixes #14688 - Power status visible on hosts index page