Replace resource.txt with resource.robot

Change-Id: I4d2afd35645880e33a31644cd717bbeae55666f0
Signed-off-by: Sandhya Somashekar <sansomas@in.ibm.com>
diff --git a/tests/test_rest_interfaces.robot b/tests/test_rest_interfaces.robot
index 856d23d..8e68695 100644
--- a/tests/test_rest_interfaces.robot
+++ b/tests/test_rest_interfaces.robot
@@ -3,7 +3,7 @@
 
 Resource          ../lib/rest_client.robot
 Resource          ../lib/openbmc_ffdc.robot
-Resource          ../lib/resource.txt
+Resource          ../lib/resource.robot
 Resource          ../lib/utils.robot
 Library           Collections