Add failure messages for clarity in test suite setup

Before fix:
Parent suite setup failed:
'' should not be empty.

After fix:
Parent suite setup failed:
Please provide required paramter OS_HOST

Change-Id: I25c409978806b1d97a8223edf1ba2526f5be31aa
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_kcs.robot b/ipmi/test_ipmi_kcs.robot
index ddb9b6c..206377d 100644
--- a/ipmi/test_ipmi_kcs.robot
+++ b/ipmi/test_ipmi_kcs.robot
@@ -36,6 +36,6 @@
 Test Setup Execution
    [Documentation]  Do suite setup tasks.
 
-    Should Not Be Empty  ${OS_HOST}
-    Should Not Be Empty  ${OS_USERNAME}
-    Should Not Be Empty  ${OS_PASSWORD}
+    Should Not Be Empty  ${OS_HOST}  msg=Please provide required parameter OS_HOST
+    Should Not Be Empty  ${OS_USERNAME}  msg=Please provide required parameter OS_USERNAME
+    Should Not Be Empty  ${OS_PASSWORD}  msg=Please provide required parameter OS_PASSWORD