Added d3 force graph to GUI2 topology

Change-Id: I6860472efaf51ea27fad74e630e687f0c6abad3d
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.html b/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.html
index 389ec9c..d745ce8 100644
--- a/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.html
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.html
@@ -13,8 +13,8 @@
 ~ See the License for the specific language governing permissions and
 ~ limitations under the License.
 -->
-<svg:g onos-mapsvg />
-<svg:g>
+<svg:g xmlns:svg="http://www.w3.org/2000/svg" onos-mapsvg />
+<svg:g  xmlns:svg="http://www.w3.org/2000/svg">
     <svg:text>Layout: {{ layoutData.id }} {{ layoutData.bgDesc }}</svg:text>
     <svg:text>Region: {{ layoutData.region }} {{ layoutData.regionName }}</svg:text>
     <svg:text>Parent {{ layoutData.parent }}</svg:text>
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.ts b/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.ts
index ff6f99a..e07f304 100644
--- a/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.ts
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/backgroundsvg/backgroundsvg.component.ts
@@ -44,6 +44,7 @@
  * Enum of the topo2CurrentRegion location type from Location below
  */
 export enum LocationType {
+    NONE = 'none',
     GEO = 'geo',
     GRID = 'grid'
 }