Change Rvalid to Valid

Change all references to keywords like "Rvalid Values" to "Valid Values".
"Rvalid Values" has been deprecated.

Change-Id: I1b418fa69e5753c8bfb9e6a06a8b566359e10cae
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/redfish/managers/test_managers_bmc_time.robot b/redfish/managers/test_managers_bmc_time.robot
index e0e7e5f..dfba145 100644
--- a/redfish/managers/test_managers_bmc_time.robot
+++ b/redfish/managers/test_managers_bmc_time.robot
@@ -152,7 +152,7 @@
     Redfish.Patch  ${REDFISH_NW_PROTOCOL_URI}  body={u'NTPEnabled': ${True}}
     ${ntp}=  Redfish.Get Attribute  ${REDFISH_NW_PROTOCOL_URI}  NTP
     Rprint Vars  ntp
-    Rvalid Value  ntp["ProtocolEnabled"]  valid_values=[True]
+    Valid Value  ntp["ProtocolEnabled"]  valid_values=[True]
 
 
 *** Keywords ***