fix: Solves the problem of devServer failing to prefix urls correctly…

[phantomjinx]

… (#344)

• Originally devServer prefix was reverted due to different urls in the app not working correctly.

• However, reverting exposed a problem with connecting to jolokia urls (Hawtio-Next #793) so need to reinstate it and fix.

• The publicPath config property must be set in the following locations and must be consistent:

  • webpack.config....js HtmlWebpackPlugin output static historyApiFallback devMiddleware (really important!) any devServer.app.get(..) calls in setupMiddlewares

• .../public/index.html

  • Must reference the publicPath property correctly

• Removes all keycloak urls to stop the keycloak plugin taking over the authentication duties

• Synchronizes all the test apps to the same configuration as the online-shell