GUI - Add default redirect on app start

GUI - Add default redirect on app start

Due Dlux split we removed Topology app from odl-dlux-core feature.
There were also default redirect to that app, so it was landing page, when
DLUX was started.
This patch adds default route to GUI in this project.

More info:
https://wiki.opendaylight.org/view/Weather#Rename_some_odl-dlux-.2A_features_to_odl-dluxapps-.2A

Also fixed errors caused by refactor in YangUI and Yangutils

Change-Id: I125ebc851b749a244b834627326833a71e8079ea
Signed-off-by: Daniel Malachovsky <dmalacho@cisco.com>