We are already using the patternfly-react Icon in most of the cases.
The only leftover is: https://github.com/theforeman/foreman/blob/develop/webpack/assets/javascripts/react_app/components/common/DocumentationLink/index.js#L4

Can remove the old Icon and replace with patternfly-react Icon.

Need to check if plugins use this Icon, considre deprecating.

Foreman Icon:
https://github.com/theforeman/foreman/tree/develop/webpack/assets/javascripts/react_app/components/common/Icon

Patternfly React Icon:
http://patternfly-react.surge.sh/patternfly-3/index.html?selectedKind=patternfly-react%2FWidgets%2FIcon&selectedStory=Icons&full=0&addons=1&stories=1&panelRight=0&addonPanel=storybooks%2Fstorybook-addon-knobs