fixing backend_status and README update

Change-Id: I1e17776447330c4e92e1ae738d488d5f475e55d2
diff --git a/xos/gui/src/app/components/vnaasMap.component.html b/xos/gui/src/app/components/vnaasMap.component.html
index 80d1649..7869ad2 100755
--- a/xos/gui/src/app/components/vnaasMap.component.html
+++ b/xos/gui/src/app/components/vnaasMap.component.html
@@ -61,7 +61,7 @@
           name="polyline"
           id="eline-{{eline.id}}"
           path="{{eline.path}}"
-          stroke-color="{{vm.colorLine(eline.backend_status)}}"
+          stroke-color="{{vm.colorLine(eline.backend_code)}}"
           stroke-opacity="1.0"
           stroke-weight="5"
           on-click="vm.elinePanel({{eline}}, true)"