Feature 8839: Modified Installation script to install OSM with

NGUI. Default installation is with light-ui.
-n ngui will install OSM with NGUI.
Resolved merge conflict.
Added NG-UI to ci_stage_3.

Change-Id: I5fc9d036427d078ac52f5cc5e43f7a02d509b482
Signed-off-by: vijaynag <vijaynag.bs@tataelxsi.co.in>