NG-UI BUG 1118 YAML not supported in config text-area when launching NS

 * Fixed the textarea that can accept the yaml/yml/json values.

Change-Id: I019d4fec3ea2584b72f5d8a539226bc0abff4cf7
Signed-off-by: Barath Kumar R <barath.r@tataelxsi.co.in>
diff --git a/src/services/SharedService.ts b/src/services/SharedService.ts
index d35e41d..f2f730e 100644
--- a/src/services/SharedService.ts
+++ b/src/services/SharedService.ts
@@ -304,6 +304,11 @@
         return tag;
     }
 
+    /** Fetch file extension @public */
+    public fetchFileExtension(fileInfo: FileList): string {
+        return fileInfo[0].name.substring(fileInfo[0].name.lastIndexOf('.') + 1);
+    }
+
     /** Method to validate file extension and size @private */
     private vaildataFileInfo(fileInfo: File, fileType: string): boolean {
         const extension: string = fileInfo.name.substring(fileInfo.name.lastIndexOf('.') + 1);