Fix variable importing

Library directive import statement shouldn't be use for this file.

Change-Id: I1e1235f58e1862ebba4f2ff21395e6aef7f93ac0
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/open_power_utils.robot b/lib/open_power_utils.robot
index 84eb0b9..fb10abf 100644
--- a/lib/open_power_utils.robot
+++ b/lib/open_power_utils.robot
@@ -1,7 +1,7 @@
 *** Settings ***
 Documentation  Open power domain keywords.
 
-Library        ../data/variables.py
+Variables      ../data/variables.py
 Resource       ../lib/utils.robot
 
 *** Keywords ***