Replace REST Power On with Redfish Power On

Changed:
  Replaced REST power operations with Redfish as REST is being
  deprecated.

Tested: Ran the tests against BMC that does not support REST.
Change-Id: If879e946e3baaaa7a3a9fcf336115f8d3dddcd98
Signed-off-by: Igor Kanyuka <ifelmail@gmail.com>
diff --git a/systest/collection/bmc_collect_sensors.robot b/systest/collection/bmc_collect_sensors.robot
index b9c0fe8..22ba2ee 100644
--- a/systest/collection/bmc_collect_sensors.robot
+++ b/systest/collection/bmc_collect_sensors.robot
@@ -77,7 +77,7 @@
     [Documentation]  Do suite setup tasks.
 
     Set Log Level  DEBUG
-    REST Power On  stack_mode=skip
+    Redfish Power On  stack_mode=skip
 
 
 Suite Teardown Execution
diff --git a/systest/collection/bmc_collect_vpd_and_hw_status.robot b/systest/collection/bmc_collect_vpd_and_hw_status.robot
index cf003f3..62dc503 100644
--- a/systest/collection/bmc_collect_vpd_and_hw_status.robot
+++ b/systest/collection/bmc_collect_vpd_and_hw_status.robot
@@ -60,7 +60,7 @@
     [Documentation]  Do test case setup tasks.
 
     Set Log Level  DEBUG
-    REST Power On  stack_mode=skip
+    Redfish Power On  stack_mode=skip
 
 
 Suite Teardown Execution