The Dropdown class component is used in rendering the Project selection dropdown in console UI.

This component has complex logic which makes it difficult for bug fixes or extending functionality. The aim of this story is to convert this to a functional component and simplify some of the code

This refactor should address the following accessibility bugs:
1874968
1887899

Design: http://openshift.github.io/openshift-origin-design/designs/administrator/future-openshift/favoriting/#favoriting-and-hiding-system-projects-in-the-project-selector