Replace resource.txt with resource.robot

Change-Id: I4d2afd35645880e33a31644cd717bbeae55666f0
Signed-off-by: Sandhya Somashekar <sansomas@in.ibm.com>
diff --git a/lib/common_utils.robot b/lib/common_utils.robot
index 594cdd3..fef4675 100755
--- a/lib/common_utils.robot
+++ b/lib/common_utils.robot
@@ -2,7 +2,7 @@
 
 Documentation  Utilities for Robot keywords that do not use REST.
 
-Resource                ../lib/resource.txt
+Resource                ../lib/resource.robot
 Resource                ../lib/connection_client.robot
 Resource                ../lib/boot_utils.robot
 Library                 String