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/systems/test_systems_inventory.robot b/redfish/systems/test_systems_inventory.robot
index 7c47fd5..b562692 100755
--- a/redfish/systems/test_systems_inventory.robot
+++ b/redfish/systems/test_systems_inventory.robot
@@ -63,7 +63,7 @@
     [Tags]  Get_System_Serial_And_Verify_Populated
 
     ${serial_number}=  Redfish.Get Attribute  ${SYSTEM_BASE_URI}  SerialNumber
-    Rvalid Value  serial_number
+    Valid Value  serial_number
     Rprint Vars  serial_number
 
 
@@ -72,7 +72,7 @@
     [Tags]  Get_Model_And_Verify_Populated
 
     ${model}=  Redfish.Get Attribute  ${SYSTEM_BASE_URI}  Model
-    Rvalid Value  model
+    Valid Value  model
     Rprint Vars  model
 
 
@@ -110,7 +110,7 @@
 
     ${serial_number}=  Redfish.Get Attribute
     ...  ${REDFISH_CHASSIS_URI}motherboard  SerialNumber
-    Rvalid Value  serial_number
+    Valid Value  serial_number
     Rprint Vars  serial_number